This file contains a list of the changes in the latest release of PLplot.
It is best to look through this file for new features, etc, until the new
documentation is complete.  To quickly understand the major changes, it
is best to look at the file NEWS, which is created by paring down the
contents of this file by omitting all but the most important info.

I typically construct entries by stripping off all the CVS (the source
maintenance program we use) commit messages from each file.  Those that
are common to all are handled separately to make it a bit less junky.
Changes that do not reflect any new capability (changes to comments,
header file shuffling, elimination of warnings, etc) I will often omit.

*****************************************************************************
PLplot 4.99j changes
Jun 6, 1995
*****************************************************************************

-----------------------------------------------------------------------------
Install scripts, makefile, etc.
-----------------------------------------------------------------------------

Changes to scripts to improve portability, by Mark Olesen:

  The Configuration files changed to use make variables PLLIB_NAME,
  PLLIB_BASE, A, ADD_DRIVER_C, ADD_DRIVER_OBJ.

  A = .a
  PLLIB_NAME is the name used for ld/linking
  PLLIB_BASE is the base part of the library name as it appears on the disc.

  These variables should assist with truncated filesystems such as DOS.

  eg.,
	UNIX
  PLLIB_NAME	= plplot
  PLLIB_BASE	= libplplot

	emx/gcc
  PLLIB_NAME	= plplot
  PLLIB_BASE	= plplot

	djgpp/gcc
  PLLIB_NAME	= plplt
  PLLIB_BASE	= libplplt

  The new Unix distribution is such that the emx and djgpp cf/ will not have
  to diverge too much from it.  This should help future portability.

--

Many changes to upgrade to Autoconf 2.3 and other improvements.  Thanks to
John Eaton for his efforts in the conversion -- it would have been a while
before I got around to it.  Even so, it still took several days of testing,
bug fixing, and additional enhancement before I was happy with it (of course
this includes time spent implementing new or improved features).  The
biggest new feature is that the build directory can be anywhere, allowing
one to easily build with multiple configurations off of one source tree.
A detailed list of changes and enhancements follows.

	* cf/configure.in:
	Comment out test and code for running configure	as ../configure.
	Use AC_CHECK_PROG, not AC_PROGRAM_CHECK.
	Use AC_ARG_WITH, not AC_WITH.  Add help strings.
	Use AC_ARG_ENABLE, not AC_ENABLE.  Add help strings.
	Simplify setting of prefix.
	Use AC_HEADER_STDC, not AC_STDC_HEADERS.
	Use AC_CHECK_HEADERS, not AC_HAVE_HEADERS.
	Use AC_FUNC_VFORK, not AC_VFORK.
	When creating Makefile.in and Makedemo.in, look for configuration
	files in $srcdir/cf, not just cf.
	Use AC_DEFINE(XX, ["$XX]), not AC_DEFINE_UNQUOTED for LIB_DIR,
	BIN_DIR, and TCL_DIR.
	When creating links, look for sources relative to $srcdir.
	Create output files before printing status message.
	Make link to $srcdir/Makefile.

	* cf/aclocal.m4:
	Use AC_MSG_RESULT, not AC_VERBOSE.
	Use AC_TRY_RUN, not AC_TEST_PROGRAM.

	* cf/init.in (srcdir, top_srcdir): New substitutions.

	* cf/initlib.in (CXX_FLAGS): Add -I. to list.
	(PLLIB_DIR, PLFNT_DIR): Set to `.', not `../lib'.

	* cf/install.in (install_lib): Look for files not created during
	the build process relative to $(top_srcdir).
	(install_demos): Likewise.

	* cf/lib_sh_sun.in (.cc.o): New rule.

	* cf/misc.in (clean): Delete $(PLLIB_BASE)* from build directory.
	(distclean): Delete config.status, config.cache, and config.log
	too.

	* cf/sysconf.in: Only print message about experimental support for
	shared libs with gcc if system really is HP.
	Use AC_CHEC_PROG, not AC_PROGRAM_CHECK.
	On SunOS-4 systems, set with_shlib=no.

	* cf/sysloc.in:
	Use AC_ARG_ENABLE, not AC_ENABLE.  Add help strings.
	Use AC_PATH_X, not AC_FIND_X.
	Use AC_TRY_CPP, not AC_TEST_CPP.
	Use AC_CHECK_LIB, not AC_HAVE_LIBRARY.

	* Makefile (all): New target, same as default.

	* cf/configure.in, cf/sysloc.in, cf/sysconf.in:
	Use AC_MSG_CHECKING, AC_MSG_RESULT, and AC_MSG_WARN instead of echo.

	* cf/configure.in: Include sysconf.in before AC_REQUIRE_CPP so
	that CC will be set before attempting to set CPP.

	* cf/sysconf.in: Only turn off shared libraries on SunOS-4 systems
	if using gcc (actually, it should be possible to make this work,
	but the flags need to be set differently).

	* cf/configure.in (AC_REQUIRE): Ask for at least version 2.3.

	* cf/aclocal.m4 (AC_PREFIX_PROGRAM): Rename from AC_PREFIX.
	Use AC_MSG_RESULT and AC_MSG_WARN instead of using echo directly.

	* cf/aclocal.m4 (AC_OUTPUT_FILES, AC_OUTPUT_HEADER):
	New macros, copied and modified from autoconf version 2.3.

	* configure.in: Create Makefile.in and Makedemo.in in the current
	directory, not in tmp.
	Call AC_PREREQ and AC_INIT before doing anything else.
	If configure has been invoked from the top-level source directory,
	cd to tmp (possibly creating it first) and then exec ../configure.
	Create links in current directory (no need to modify $srcdir now).
	Create output files in current directory, not in tmp.

Other changes:

- configuration file loading was busted by Autoconf 2.x, I had to hack
the AC_INIT_NOTICE macro to allow it to work.

- the option to skip loading the defaults file is now invoked by using any of: 
-without-defaults, --without-defaults, -with-defaults=no, --with-defaults=no
to be more like typical configure parameters.  It is handled differently
than the rest but this is transparent to the user.  A help entry is
provided. 

- the PLplot version of the AC_PREFIX_PROGRAM macro fixed to work under
Autoconf 2.x

- a fixed version of the AC_PROG_CPP macro was added

- new macros added to dramatically simplify sysloc.in: FIND_INC, FIND_LIB,
ADD_TO_INCS, and ADD_TO_LIBS. 

- a patched version of AC_ARG_ENABLE added that ignores missing help
entries.  Good for forbidding certain command line input or making invisible
options.

- new macros: MY_ARG_WITH, a front-end to AC_ARG_WITH, and MY_ARG_ENABLE, a
front-end to AC_ARG_ENABLE.  MY_ARG_WITH registers a with_<opt> flag while
forbidding the use of enable_<opt>.  MY_ARG_ENABLE registers an enable_<opt>
flag while forbidding the use of with_<opt>.  Aimed at reducing the user's
frustration with incorrect command input caused by confusing the two (which
normally doesn't result in any kind of warning or error).

- added --with-nobraindead (not for general use).

- added a SHARED variable to the configure/Makefile that is only set when
building shared libraries and is used to decide whether executables need to
be rebuilt before installing (better than old way).

- Now try to create links to source files each time configure is run,
sending output to /dev/null.  A help to developers when new files have
been added to the source tree since the first time configure was run.

- The run results now sent to the file config.summary, so you can type
"ls config.*" to see all the informational files created by configure.

- Now searches for vendor Fortran compiler if enable_f77=yes.  If that
isn't found, switches to f2c.  If that isn't found, enable_f77 is set
to "no" (Fortran interface layer is omitted).

- added --with-dbmalloc, for linking with a debugging malloc library.

- updated install target to reflect recent changes and improved shared
library behavior


Other miscellanea:

install.in: 
Added soft link in examples/tk to all the examples/tcl/x??.tcl files, since
they are used by both tcldemos.tcl and tkdemos.tcl now.

sysloc.in: 
Eliminated some dangerous whitespace (only in the Bourne shell!).  Thanks to
John Interrante for this fix.

Makefile:
Changed the 'realclean' target to 'distclean'.  Thanks to John Interrante
for the suggestion.

misc.in:
Changed all occurances of 'rm' to $(RM).  Inserted the 'distclean' target:
thanks to John Interrante for the suggestion.

init.in:
Inserted RM = rm -f definition.  The -f option represses the warning by rm
if the file doesn't actually exist (change suggested by John Interrante).

configure.in:
Now only creates tmp/shared if shared libraries are being built.
Removed check for install script -- I don't use one yet.  Added check for
a library popen() call to make the -h output piping portable.

install.in:
Now only rebuilds executables during installation if the shared/ subdir is
present (i.e. if shared libraries are being built).

lib_ar.in lib_sh.in lib_sh_aix.in lib_sh_sun.in:
Eliminated special treatment for all files except tcpip.c.  If the optimizer
won't work, either: get the vendor to fix it, configure --without-opt, or
hand-roll the makefile.  It's too much work to keep special cases around.

sysconf.in:
Fixed CPP value when gcc is in use.  Cleaned up shared library support.

Added Files: lib_sh_linux.in 
configure.in sysloc.in:
Support generation of shared lib on Linux, using ELF tools.


plConfig.h.in:
 * Revision 1.7  1995/06/01  21:35:54  mjl
 * Added HAVE_POPEN and HAVE_ITCL macros.
 *
 * Revision 1.6  1995/05/15  07:56:07  mjl
 * Made the macros DEBUGGING_MALLOC and NOBRAINDEAD configurable.

-----------------------------------------------------------------------------
Main source files
-----------------------------------------------------------------------------

pdfutils.c:
 * Changed debug output to use new pldebug() function.
 *
 * Fixed up Copyright message.

plargs.c:
 * Now only pipes help output through a pager if HAVE_POPEN is defined (done
 * during configure).  Added check in plMergeOpts() to ensure the user isn't
 * passing an improperly-terminated options table.
 *
 * Fixed problem with file header.
 *
 * Protect against NULL pointer dereference.
 *
 * Added handling for new flags: -verbose, -debug, -ncol0, -ncol1.  Eliminated
 * all uses of PL_OPT_ENABLED in favor of PL_OPT_DISABLED (applied in reverse).
 * Changed help (-h) output to pipe output to $PAGER if available, otherwise
 * "more" (if found).  Still needs to be made portable using configure -- right
 * now only works under Unix.  Other minor tweaks.
 *
 * Changed ProcessOpt to mallocate a temporary copy of an option before giving
 * it to a handler function if PL_PARSE_NODELETE is specified.  Some of the
 * handlers call strtok(), altering the option they are handed.
 *
 * Fixed plParseOpts() to correctly remove recognized arguments from argv[].
 *
 * Massively reworked.  Now it is absolutely trivial to merge user command line
 * options to the internal options list for use when parsing the command line.
 * The globally visible functions are now:
 *
 *   plClearOpts()   Clear internal option table info structure.
 *   plResetOpts()   Reset internal option table info structure.
 *   plMergeOpts()   Merge user option table into internal info structure.
 *   plSetUsage()    Set the strings used in usage and syntax messages.
 *   plSetOpt()      Process input strings, treating them as an option and
 *                   argument pair.
 *   plParseOpts()   Process options list using current options info.
 *   plOptUsage()    Print usage & syntax message.
 *
 * See internal documentation and either x01c.c or plrender.c for example
 * usage.
 *
 * Fixed exit with an error code of 0 (was 1) when encountering a -v or -h.
 * Nicer in shell scripts when only verifying the version number.
 *
 * Fixed some braindamage incurred last update.
 *
 * Handling of the geometry string improved; now handles strings of the form:
 *     1) -geometry WxH+Xoff+Yoff
 *     2) -geometry WxH
 *     3) -geometry +Xoff+Yoff or -geometry Xoff+Yoff
 *     4) -geometry 0x0+Xoff+Yoff
 * (previously only types 1&2 were handled).  Contributed by Mark Olesen.
 *
 * Added -freeaspect command line flag, also fixed a bogosity introduced
 * last update.
 *
 * Added PL_PARSE_MERGE, set if passed in table is to be merged with internal
 * options.  Function will return on first unrecognized input.  This is the
 * preferred way to combine user and internal options.  User options have
 * precedence over internal options.  Also changed parsing to allow for
 * "holes" in argv list (i.e. all argc entries are checked even if some are
 * 0-length strings or null).

plbox.c:
 * Eliminated some temporary variables and variables not in use.
 *
 * Fix to increase spacing between inverted tics and numeric labels; in some
 * cases they were running into each other.  Contributed by John Interrante.
 *
 * Added new options:
 *   f: Always use fixed point numeric labels
 *   h: Draws a grid at the minor tick interval
 * See x04c for an example of both of these (second plot).
 * Upgraded plaxes() to be a perfect superset of plbox() (now plbox is
 * just a front-end to plaxes).  Substantially improved code structure and
 * eliminated some inconsistencies.
 *
 * Fix for obscure 3d plotting bug, contributed by Bryan Peterson.

plbuf.c:
 * Cruft elimination.
 *
 * All drivers: eliminated unnecessary variable initializations, other cleaning
 * up.  Added code to write & restore plot window parameters.

plcont.c:
 * Eliminated a #pragma message() that some people found objectionable :-).

plcore.c:
 * Added some casts to eliminate warnings under SunOS 4.x.
 *
 * Changed debugging output to use new function pldebug().  Added plstrm_init()
 * for stream initialization, including color map allocation, and added calls
 * to it in appropriate places.  Added free(colormaps) in plend1().  Changed
 * plcpstrm() to deal correctly with new variable-sized colormaps.
 *
 * Made the plsc->plwin array circular so that if we run out of windows we just
 * start over from 0.  Also, plTranslateCursor now starts with the most
 * recently created windows, rather than the oldest, since newer windows are
 * more likely to be relevant.  Contributed by Radey Shouman.
 *
 * Moved font-related code into plsym.c.
 *
 * Added plP_swin to set up plot window parameters.  Changed driver
 * transformation code to make calls to plP_dcpcx, plP_dcpcy, plP_pcdcx,
 * plP_pcdcy where appropriate.  Changed to use new variables plsc->phyxlen,
 * plsc->phyylen where appropriate.  Changed printf's in device prompt code to
 * fprintf to stdout or stderr to be more flexible on non-Unix systems.  The
 * function plsMouseEH was changed to plsButtonEH (more accurate), and both
 * this and the plsKeyEH function changed to take a PLGraphicsIn *.  Obsolete
 * functions plsasp and plslpb removed.  Many accessor functions removed.
 *
 * Changed orientation swapping code to not preserve aspect ratio if
 * plsc->freeaspect is set.
 *
 * Moved a misplaced line of code affecting stream cleanup.
 *
 * Changed a PLINT to an int to make a DOS compiler happy about its use as a
 * for loop index.  Now plsc->ipls is set as soon as a new stream is created
 * (by plsstrm).  Last: when stream 0 is ended by plend1() or plend(), the
 * stream data is zeroed out to prevent garbage values from hanging around.

plctrl.c:
 * Moved code that was previously in plstream.c into here.
 *
 * A nit.
 *
 * Fix overrun of allocated memory.  Can now call plinit() again without
 * getting an immediate core dump.
 *
 * Changed debugging output to use new function pldebug().  Added static
 * functions plcmap0_def() and plcmap1_def() for setting up default color maps;
 * eliminated old global functions plCmap0_init() and plCmap1_init().  Changed
 * plscmap0n() and plscmap1n() actually allocate the color maps based on the
 * requested number of colors.  These can be called at any time to change the
 * number of colors in use by PLplot, although the best time is before driver
 * initialization (since the drivers are typically not as dynamic).
 *
 * Fixed plscmap1l documentation and changed call syntax to pass "rev" array.
 *
 * Fixed some braindamage incurred last update.
 *
 * Interpolation of control points in cmap1 space (between n and n+1th
 * control points) now goes around the "back" side in hue (hue = 0) if
 * cmap1cp[n].rev is set.  There are some smooth color maps that are
 * unattainable without this capability.
 *
 * Ifdef inserted to handle pathnames under VMS.

plcvt.c:
 * Miscellaneous cleaning up, comments added.  Functions added for converting
 * from device coordinates to other coordinates.

pldtik.c:
 * Broke pldtik() into two functions -- pldtik(), which handles only tick
 * spacing, and pldprec(), which handles only precision and significant
 * digits settings.  Each substantially clarified in the process.

plot3d.c:
 * Changed names of some variables defined at file scope to remove a conflict
 * in the Mac port.
 *
 * Eliminated many unnecessary accessor variables.
 *
 * Switch to the new syntax for pldtik().

plpage.c:
 * Made the plsc->plwin array circular so that if we run out of windows we just
 * start over from 0.  Also, plTranslateCursor now starts with the most
 * recently created windows, rather than the oldest, since newer windows are
 * more likely to be relevant.  Contributed by Radey Shouman.
 *
 * plGetCursor() changed to take a (PLGraphicsIn *).  Now this function is
 * just a front-end.  plTranslateCursor() added to do the work of looking up
 * the world coordinates.  Eliminated plClrCWindows().
 *
 * Switch to the new syntax for the window structure -- now part of the
 * plstream.
 *
 * Name changes to cursor variables, changed plAddCWindow() call syntax.

plshade.c:
 * Changed debugging output to use new function pldebug().
 *
 * Correct to notice if either pltr or pltr_data is NULL.  Required to
 * make C++ abstraction work correctly.

plsym.c:
 * Changed debugging output to use new function pldebug().
 *
 * Changed plhrsh() to plot continuous symbols even if the current line style
 * is dashed (symbols plotted in dashed line styles look pretty odd).
 * Contributed by Radey Shouman.
 *
 * Absorbed all string and font related code from plstring.c and plfont.c.  Now
 * most of this is all internal to this file, so some global variables and
 * functions were made static.  Changed names of a variable defined at file
 * scope to remove a conflict in the Mac port.
 *
 *
 * Old log entries from plsym.c:
 *
 * Added a fast point draw capability: if code=-1 is given to plpoin or
 * plpoin3, instead of drawing a Hershey font character it draws a point
 * using simply a move and draw.  This is at least 4X faster.
 *
 * Changed syntax of the new 3d function plpoin3() to be more like plpoin(),
 * and moved to this file.
 *
 * Old log entries from plstring.c:
 *
 * Eliminated unnecessary accessor variables and other cleaning up.

plvpor.c:
 * Eliminated unnecessary accessor variables and other cleaning up.

plwind.c:
 * Eliminated unnecessary accessor variables and other cleaning up.
 * Added call to plP_swin() to set window parameters.
 *
 * Changed plAddCWindow() call syntax.

-----------------------------------------------------------------------------
Main header files
-----------------------------------------------------------------------------

drivers.h:
 * Changed plstream.h -> plstrm.h everywhere.
 *
 * Prototypes for Mac driver.

metadefs.h:
 * Obsoleted old metafile types and other cleaning up.

plcdemos.h:
 * All C demo files: changed file inclusion to use quotes instead of angle
 * brackets so that dependencies are retained during development.
 *
 * Added include of ctype.h for the demos that need it.
 *
 * Created to keep all the junk common to the C demos.  Helps to keep me
 * from cluttering up plplot.h.

plcore.h:
 * Repaired some bogus comments.
 *
 * Added include of pldebug.h for debugging support.
 *
 * Two font control variables moved elsewhere.
 *
 * Changed a PLINT to an int to make a DOS compiler happy about its use as a
 * for loop index.

pldebug.h:
 * Include malloc.h (for debugging malloc) if DEBUGGING_MALLOC is defined.
 *
 * Added to help with debugging support.  Includes macros as well as a
 * static function pldebug, which has a stdarg (vargarg) based argument list.
 * Debugging output is only enabled if DEBUG is defined prior to inclusion of
 * this file and the debug stream variable is set (can be set by -debug command
 * line option).

plevent.h:
 * Changed definitions of control keys with ASCII equivalents to their ASCII
 * value rather than the Xlib value.  These include: PLK_BackSpace, PLK_Tab,
 * PLK_Linefeed, PLK_Return, PLK_Escape, and PLK_Delete.  Using ASCII for
 * these just makes more sense.

plplot.h:
 * Added PL_OPT_DISABLED, and not that PL_OPT_ENABLED is obsolete.  Removed
 * TK related function declarations -- prototypes for these now must be
 * obtained by including pltk.h.
 *
 * Moved inclusion of <math.h>, <string.h>, and <ctype.h> to plplotP.h, since
 * they are strictly needed by plplot.h.
 *
 * Added include of ctype.h.  Added PLESC_SWIN driver escape function define,
 * used to set plot window parameters.  Added defines for window parameter
 * flags PLSWIN_DEVICE and PLSWIN_WORLD.  Obsoleted the PL_PARSE_OVERRIDE and
 * PL_PARSE_MERGE flags as well as plParseInternalOpts() and plSetInternalOpt()
 * function calls.  Eliminated the PLCursor, PLKey and PLMouse input structures
 * in favor of a PLGraphicsIn structure, which is used for all graphics input.
 * Changed the PLWindow struct to the name PLDisplay (holds display-oriented
 * data) and added the width and height members.  Changed the plCWindow struct
 * to the name PLWindow and tweaked the types of the structure members to be
 * more relevant.  Eliminated defines and prototypes for the obsolete plsasp()
 * and plslpb() API functions.  Changed/added prototypes for plsKeyEH and
 * plsButtonEH to expect first handler argument to receive a (PLGraphicsIn *).
 * Changed/added prototypes for parse routines (see plargs.c).  plGetCursor()
 * also now expects a (PLGraphicsIn *), and prototype for plTranslateCursor()
 * added.
 *
 * Changed prototype for plscmap1l().
 *
 * Moved definition of window coordinate structure into here.  Also changed
 * window relative device coordinate names to something more appropriate
 * (this is the last time I will change this, I promise).
 *
 * Added PL_PARSE_MERGE flag for merging user option tables with internal one.
 *
 * Changed stream variables vpX, vpY to vdX, vdY, since they now hold the
 * relative device coordinates (0 to 1) rather than the physical coordinates.
 *
 * Correction to work with the one true language, C++.
 *
 * Fixed prototype for pltkMain().

plplotP.h:
 * Repaired some bogus comments.
 *
 * Changed plstream.h -> plstrm.h everywhere.
 *
 * Added include of pldebug.h so that all PLplot source files now get it.
 * Eliminated prototypes for obsolete functions plCmap0_init() and
 * plCmap1_init() and added prototype for new function plstrm_init().
 *
 * Eliminated SCHAR in favor of simply "signed char".  Removed prototypes
 * for obsolete functions.
 *
 * Moved inclusion of <math.h>, <string.h>, and <ctype.h> to plplotP.h, since
 * they are strictly needed by plplot.h.
 *
 * Prototypes for many obsolete accessor functions removed.  Prototype for
 * new function plP_swin added.
 *
 * Now drops down to pre-ANSI-C behavior as regards fpos_t under VMS since
 * the code in plmeta.c doesn't work under the VMS implementation.
 *
 * Moved definition of window coordinate structure into plplot.h since it's
 * now used in the plstream definition.  Also updated prototype for pldtik
 * and added prototype for pldprec.
 *
 * Changed stream variables vpx.. to vdx.. since they now hold the relative
 * device coordinates (0 to 1) rather than the physical coordinates.
 *
 * Virtual coordinate space for X-based drivers and metafile increased to
 * 32K by 32K, in order to improve appearance of plots at high levels of
 * magnification.

plserver.h:
 * Changed header file inclusions.
 *
 * Added include of pltk.h.

plstream.h:
// Fixed include file semantics.
//
// Changed to a more natural naming scheme.
//
//
// Old Log entries (as stream.h):
//
// Mostly formatting improvements, but also some overloading resolutions
// and some C++ style considerations.
//
// Fixed return codes for new interface routines.
//
// Fixed prototype for scmap1.
//
// Beginnings of 2-d abstraction for contouring and shading.  Better
// constructors.  Names for colors.  Other minor stuff.  Still need to do
// major hacking on the 2-d abstraction, and also need to remove large
// numbers of unnecessary methods.
//
// New C++ wrapper around the PLplot API.  Needs much work.

plstrm.h:
 * Name change.  Went by the book this time.
 *
 * Changed plstream.h -> plstrm.h everywhere.
 *
 * Added new stream variables: verbose (be more verbose than usual), debug
 * (print debugging output to stderr), and initialized (set if the stream has
 * been initialized).  Eliminated cmap0setcol and cmap1set.  Changed cmap0 and
 * cmap1 declarations to be just pointers (allocation now done during stream
 * initialization).
 *
 * Added variable plbuf_read for use when reading from the plot buffer.  Added
 * variable dev_swin for drivers that need calls to set plot window parameters
 * directed their way. Changed the name *MouseEH to *ButtonEH.  Changed event
 * handler prototypes to accept a (PLGraphicsIn *).  Added a *LocateEH and
 * *LocateEH_data.  Added the variables phyxlen and phyylen.  Changed name
 * "nCWindows" to nplwin, "windows" to plwin.  Eliminated obsolete variables
 * dpxscl, dpxoff, dpyscl, dpyoff, mpxscl, mpxoff, mpyscl, mpyoff.  Added
 * prototype for plGinInit();
 *
 * Fixed some braindamage incurred last update.
 *
 * Added "freeaspect" stream variable: if set, aspect ratio is not preserved
 * on orientation swaps.
 *
 * Made window coordinate structure a stream variable as it should be.

pltcl.h:
 * Made C++ friendly.
 *
 * Split off IPC routine prototypes (not needed by user) into tcpip.h.
 *
 * Added prototype for pltclMain().

pltk.h:
 * Added include of pltcl.h.
 *
 * Fix bogus C++ unfriendly header.
 *
 * Added to hold all TK-related PLplot global function prototypes.

pltkd.h:
 * Added to hold all definitions & prototypes specific to the Tk driver.
 * There shouldn't be much need for the user to access this now, but it's
 * here if you want it.
 *
 *
 * Old log entries from plplotTK.h:
 *
 * Added include of pltk.h, dp.h (if DP extensions requested), and added new
 * variables updatecmd and child_pid to state structure.
 *
 * Old cursorX, cursorY variables replaced with a PLGraphicsIn structure.
 * Also variables instr, max_instr, and locate_mode added.
 *
 * Added cursorX, cursorY for holding coordinates at mouse click.

plxwd.h:
 * Created to hold definitions and prototypes specific to the X-driver.  The
 * user shouldn't need to access this file but it's here just in case.
 *
 *
 * Old entries from plplotX.h:
 *
 * Changed plstream.h -> plstrm.h everywhere.
 *
 * Made the ordinary graphics context and the current color a device-dependent
 * quantity rather than a display-dependent one, to fix problems with color
 * selection when plotting to separate streams/xwindows.  Thanks to Radey
 * Shouman for pointing it out.
 *
 * Old cursorX, cursorY variables replaced with a PLGraphicsIn structure.
 * Also variables added for dealing with graphic crosshairs.
 *
 * Added cursorX, cursorY for holding coordinates at mouse click.
 *
 * Added prototypes for plD_open_xw() and plX_setBGFG().

tclMatrix.h:
 * Added missing include of iostream.h for C++ codes including this.
 *
 * Eliminated extraneous include of tcl.h.
 *
 * Added interpreter to tclMatrix struct for more robust resource recovery.

tcpip.h:
 * Header file for IPC function prototypes.

-----------------------------------------------------------------------------
C Example programs
-----------------------------------------------------------------------------

All C demo files: 
 * changed file inclusion to use quotes instead of angle
 * brackets so that dependencies are retained during development.

 * now include "plcdemos.h" to get all startup
 * definitions and includes that are useful to share between them.

 * changed plParseInternalOpts() call to plParseOpts().

x01c.c:
 * Updated options table syntax -- PL_OPT_ENABLED no longer used.  Fixed
 * error exit.
 *
 * Changed locate code to new syntax (using a PLGraphicsIn).  Added a command
 * line option "-locate" to turn on the locate code (off by default).  This
 * also illustrates how easy it is for PLplot to parse user command line flags.
 *
 * Switched to the new syntax for the window structure variables and
 * shortened the info printed out by the get cursor loop.
 *
 * Name changes to locator coordinate variables.

x14c.c:
 * Changed to use Tk driver instead of DP, since DP doesn't handle cleanup
 * from multiple interpreters correctly (problem is in Tcl-DP I think).

x15c.c:
 * Fixed arglists for plscmap1l().

x16c.c:
 * All data structures now allocated at runtime to allow greater flexibility.
 * Command line options added: -ns <n>, sets number of shaded levels, -nx <n>
 * and -ny <n> set number of data points in x and y, respectively.

-----------------------------------------------------------------------------
F77 API
-----------------------------------------------------------------------------

scstubs.c:
 * Eliminated obsolete functions PLSASP and PLSLPB.
 *
 * Fixed plscmap1l documentation and changed call syntax to pass "rev" array.

All f77 demos:

! All use of double quotes for Fortran strings (not strictly legal)
! eliminated in favor of single quotes.

-----------------------------------------------------------------------------
Tcl API
-----------------------------------------------------------------------------

pltcl.c:
 * Now is [incr Tcl] aware, if HAVE_ITCL has been defined (done during
 * configure).
 *
 * Changed to use new name for options-parsing function plParseOpts().
 *
 * Changed prompt.
 *
 * Changed to a more powerful prompt mechanism.  Prompt now gives program
 * name (pltcl) followed by an underscore and the current stream number.
 * Very handy when doing multiple stream work.
 *
 * Changed the syntax for pltclMain() in order for it to work better with
 * shared libraries.  In particular, Tcl_AppInit is no longer external but
 * passed as a function pointer.

tclAPI.c:
 * Added new Tcl API functions plscol0 and plscolbg for color setting.
 *
 * Fixed Copyright message and other cleaning up.
 *
 * Added "loopback" command: gobbles the following word, which must be "cmd",
 * and processes the remaining arguments as any other plplot/Tcl command.
 * This allows scripts involving widget commands -- of the form <widget> cmd
 * <plplot command> -- to be processed by pltcl, with <widget> replaced
 * by "loopback".
 *
 * Imlemented plshade from Tcl.
 *
 * Add knowledge of contouring.
 *
 * New Tcl API functions added: plend, plend1, plsstrm, and plinit.

tclMain.c:
 * Changed the syntax for pltclMain() in order for it to work better with
 * shared libraries.  In particular, Tcl_AppInit is no longer external but
 * passed as a function pointer.

tclMatrix.c:
 * Support for N-d initializer lists.  Contributed by Martin L. Smith.
 *
 * Added the optional -persist flag to the matrix command line.  If present
 * (can be anywhere on the line), the matrix is not automatically deleted
 * when the scope of the current proc (method) ends.  Instead, you must
 * explicitly clean up by using either the 'delete' matrix command or renaming
 * the matrix command name to {}.  Should now work correctly from within itcl.
 * Copyright message fixed.

All Tcl demos:

# Changed comment syntax to "the one true way".

New files:
	x01.tcl x02.tcl x03.tcl x04.tcl x05.tcl x06.tcl x07.tcl 
	x08.tcl x09.tcl x10.tcl x11.tcl x12.tcl x13.tcl x14.tcl 
	x15.tcl x16.tcl 
Log Message:
New Tcl example files.  Can now be run from either pltcl -- using the
"loopback" command as argument, or from plserver (or other plplot-aware
extended wish) -- using the widget name as argument.

plgrid.tcl: (new)
# Demo proc for plotting a polar grid.

plot.tcl: (new)
# A minimal implementation of the GNUPLOT "plot" command.

tcldemos.tcl:
# Removed the "loopback" parameter since it's no longer necessary.
#
# New front-end demo file for use from pltcl.  Uses new "loopback" command
# to run scripts also used with a plframe widget.

-----------------------------------------------------------------------------
Python API
-----------------------------------------------------------------------------

Added plmodule.c: glue code for python interface.
Written by: interran@uluru.Stanford.EDU (John Interrante)

-----------------------------------------------------------------------------
Drivers
-----------------------------------------------------------------------------

All drivers: 
 * eliminated unnecessary variable initializations, other cleaning up.

 * pls->width now more sensibly handled.  If the driver supports
 * multiple widths, it first checks to see if it has been initialized
 * already (e.g. from the command line) before initializing it.  For drivers
 * that don't support multiple widths, pls->width is ignored.

ljiip.c:
 * Minor tweek.  Modified the pixel width to depend on the slope of the line.
 * Makes diagonal lines thinner.  Contributed by Wesley Ebisuzaki.

plmeta.c:
 * Changed debugging output to use new pldebug() function.
 *
 * Added preliminary code to write & restore plot window parameters.

ps.c:
 * Fixed braindamage incurred last update.  Now switches to transparent
 * background mode (no page fill) automatically if background color is white.
 * Useful for including color EPSF files into TeX or whatever.
 *
 * Fixed background color fill to cover the entire page, including margin
 * area.  
 *
 * Now generates ps files with the correct PLplot version number written.

tek.c:
 * Changed debugging output to use new pldebug() function.
 *
 * All drivers: eliminated unnecessary variable initializations, other cleaning
 * up.  Changed structure for graphics input to a PLGraphicsIn (was PLCursor).
 * Substantially rewrote input loop to handle new locate mode (type 'L' while
 * at a page break).
 *
 * Fixed some braindamage incurred last update.
 *
 * Inserted GIN (Graphics Input) code to handle PLESC_GETC escape command
 * (retrieves cursor position).  Also added "pick" (P) end of page command,
 * which allows you to fetch the world coordinates of arbitrary points based
 * on graphics input (type "P" while at end of page, note: not supported by
 * xterm).  All drivers: pls->width now more sensibly handled.  If the driver
 * supports multiple widths, it first checks to see if it has been
 * initialized already (e.g. from the command line) before initializing it.
 * For drivers that don't support multiple widths, pls->width is ignored.

xwin.c:
 * Changes to header file inclusion.
 *
 * Undid some of the damage from the last commit.  It turns out that while
 * writes to the screen first look better on a resize, writes to the pixmap
 * first (which is blitted to the screen when the write is finished) look
 * better on a redraw, e.g. when scrolling.  So now the code is no longer
 * shared between them to allow the order of operations to be different in
 * each case.
 *
 * Fixed problem with color allocation that was causing code death on
 * monochrome X terminals.  Reordered resize operations so that window is
 * drawn to first, then pixmap copied after that (more natural looking).
 *
 * Split the crossing event handler into separate enter and leave event
 * handlers to better keep track of whether we should be drawing graphic
 * crosshairs or not.  Now works properly under all combinations of expose,
 * pointer in or out of window, and with or without a pixmap, as far as I can
 * tell.  Added more cool stuff to be done when -debug is specified.
 *
 * Changed debugging output to use new pldebug() function and improved.
 * Reduced max number of cmap1 colors to try to allocate to reduce conflicts
 * with other programs (like Mosaic).  Added event handling for EnterNotify
 * and LeaveNotify events, to draw or eliminate crosshairs (if being drawn),
 * respectively.
 *
 * Made the ordinary graphics context and the current color a device-dependent
 * quantity rather than a display-dependent one, to fix problems with color
 * selection when plotting to separate streams/xwindows.  Thanks to Radey
 * Shouman for pointing it out.
 *
 * Moved initialization of the write_to_pixmap and write_to_window vars to the
 * regular driver initialization part, to give plframe users a way to specify
 * the nopixmap option and have it actually work.
 *
 * All drivers: eliminated unnecessary variable initializations, other cleaning
 * up.  Changed structure for graphics input to a PLGraphicsIn (was PLCursor).
 * Substantially rewrote input loop to handle new locate mode (type 'L' while
 * at a page break).  Implemented true graphic crosshairs for use while locate
 * mode is active.
 *
 * Replaced calls to XCheckMaskEvent with calls to XCheckWindowEvent, since
 * there may be more than one event handler active per display (suggested by
 * Radey Shouman).  All drivers: pls->width now more sensibly handled.  If
 * the driver supports multiple widths, it first checks to see if it has been
 * initialized already (e.g. from the command line) before initializing it.
 * For drivers that don't support multiple widths, pls->width is ignored.
 *
 * Added locator handling.  When escape function is called with a PLESC_GETC
 * operation, the cursor switches to crosshair and it sits in the X event
 * loop, waiting for a left mouse click.  The coordinates are stored in the
 * data structure passed to the escape function, and the cursor reverts to
 * the default (now unchanged from the system default).
 *
 * Restructured X initialization, and added the function plD_open_xw() to
 * allow early access (before calling plinit) to the X driver data
 * structures.  Currently used by the plframe widget to ensure that fg/bg
 * colors are consistent in both the widget and the driver.  The fg color is
 * now set dynamically so that rubber-band drawing will always give a good
 * contrast to the background color.
 *
 * Fixed yet more stupid bugs that cause alloc/free or strcmp problems on
 * some systems.
 *
 * Color allocation changed: now cmap1 entries aren't allocated until the
 * first time a cmap1 color is requested.  This will help prevent running out
 * of colors when many PLplot X windows from independent processes are active
 * (as long as cmap1 isn't being used).
 *
 * Fixed problem with if-test for display name introduced last update.
 *
 * Inserted workaround for cases where NULL was being used as argument to
 * strcmp (some systems don't like it).

-----------------------------------------------------------------------------
TK driver, plframe widget, and support tools
-----------------------------------------------------------------------------

plframe.c:
 * Fixed obscure bug that was causing the plframe to not be properly
 * redisplayed after a zoom in some cases.
 *
 * Changed header file inclusions.
 *
 * Changed "save as" widget command to accept device keyword, not number.
 * Eliminated "info devices" widget command in favor of "info devkeys", which
 * returns device keywords, and "info devnames", which returns device names.
 *
 * Fixes for Tk 4.0.  Updated Tk_Draw3DRectangle syntax when compiling with
 * Tk versions 4.0 and later.  Eliminated -geometry option for much the same
 * reason as it was eliminated in the Tk 4.0 frame, to avoid problems with
 * some valid X *geometry specifications.  Use -width and/or -height instead.
 * Code is still compatible with Tk 3.6 and should remain so for a while.
 * Newer Tk 4.0 frame options like -class, -colormap, and -visual will be
 * added at a later date.
 *
 * Split the crossing event handler into separate enter and leave event
 * handlers to better keep track of whether we should be drawing graphic
 * crosshairs or not.  Now works properly under all combinations of expose,
 * pointer in or out of window, and with or without a pixmap, as far as I can
 * tell.
 *
 * Added EnterNotify and LeaveNotify event handling, to draw or undraw
 * crosshairs as needed.  Improved debugging output.
 *
 * Implemented a new "report" widget command for performing on-demand
 * translations of window coordinates to world coordinates.  This is
 * especiallly useful when invoked from within a Tk binding.
 *
 * A data link cleanup command added.
 *
 * Implemented graphic crosshairs, which are turned on or off using the
 * "-xhairs <boolean>" widget configure command.  This inserts an event handler
 * to draw and update the graphic crosshairs on cursor motion, as well as
 * intercepting cursor key movements and moving the drawn cursor appropriately.
 * The expose event handling was broken off into a separate handler and changed
 * to redraw the graphic crosshairs if necessary.
 *
 * Changed widget commands to set/get the cmap1 palette to handle the new
 * "rev" cmap1 control point attribute.
 *
 * Now uses "early initialization" of PLplot X driver so that the fg/bg
 * colors can be set from the plframe widget.  This ensures that fg/bg colors
 * are consistent in both the widget and the driver, even if the bg color is
 * changed dynamically (through program or user interface control).  A bug
 * fixed in the xor GC also.  This fixes problems with the rubber-band
 * drawing (used in zooms), where the line color would sometimes change or be
 * hard to see against the background.
 *
 * Incorrect order of calls to freeing malloc'ed memory at exit fixed, found
 * by Brent Townshend.

plr.c:
 * The Copyright message was changed and general cleaning up done.

plserver.c:
 * Is now [incr Tcl] aware, if HAVE_ITCL is defined (done during configure).
 *
 * Improved debugging output and fixed a bug in the exit handling.
 *
 * Offloaded the C code for cleaning up from plserver.c into the proc
 * plserver_link_end in plserver.tcl.  The Tcl code was modified to better
 * handshake with the client (plplot TK driver) program.
 *
 * Fixed the Copyright message and general cleaning up.
 *
 * Minor exit handling fix for Tk communication.
 *
 * Now does a bit more complete cleanup at exit when communicating with the
 * Tcl-DP driver, to avoid potential problems.
 *
 * Changed the syntax for pltkMain() in order for it to work better with
 * shared libraries.  In particular, Tcl_AppInit is no longer external but
 * passed as a function pointer.

tcpip.c:
 * Change to header file inclusion.
 *
 * Eliminated a bogus call to Tk_DeleteFileHandler() and other cleaning up.

tk.c:
 * Changes to header file inclusion.
 *
 * Now saves the child process PID and uses it to wait for it to complete at
 * exit, for a bit nicer of error termination.  Still needs to be tested on
 * more platforms.  Improved debugging output and switched to new pldebug()
 * function.  Added widget configure commands to set ncol0 and ncol1.
 *
 * Offloaded the C code for cleaning up from tk.c into the proc
 * plclient_link_end in plclient.tcl.  The Tcl code was modified to better
 * handshake with plserver.
 *
 * All drivers: eliminated unnecessary variable initializations, other cleaning
 * up.  Changed structure for graphics input to a PLGraphicsIn (was PLCursor).
 * Substantially rewrote input loop to handle new locate mode (type 'L' while
 * at a page break).
 *
 * Fixed to work with new locator variables.
 *
 * Added locator handling.  When escape function is called with a PLESC_GETC
 * operation, the driver simply goes into an event loop, waiting for a mouse
 * event to be reported back from plserver.  The coordinates are stored in
 * the data structure passed to the escape function.  Still to be added is
 * some way to tell plserver to change the cursor to crosshair in order to
 * better prompt user input.
 *
 * Significantly improved cleanup upon exit, especially when using the Tcl-DP
 * driver.  Fixes the problem of spurious core dumps that sometimes occurs
 * when exiting Tcl-DP streams.  There were two problems: one was that a race
 * condition between the tk.c and plserver.c cleanup was occuring, leading to
 * cores in libc (typically) due to stuff being freed twice.  The other is
 * due to some bogosity in Tcl 7.3 and/or Tcl-DP 3.2. Tcl_DeleteInterp()
 * doesn't provide all the necessary cleanup when exiting, and a filehandler
 * event for the old interpreter is generated /after/ the old interpreter has
 * been deleted.  This results in an attempt to use a hash table that has
 * already been deleted, and a panic.  I tried to find the offending code
 * while in the debugger but it looks like a tough one to crack, hence this
 * workaround.  Mostly seen when using multiple DP output streams from pltcl.

tkMain.c:
 * Changed the syntax for pltkMain() in order for it to work better with
 * shared libraries.  In particular, Tcl_AppInit is no longer external but
 * passed as a function pointer.

FileSelector.tcl:
# PLplot/Tk now has a file selector!  Courtesy of Mark L. Ulferts, and you
# need to have [incr Tcl] installed to use it.

PLWin.tcl:
# Stub method for plshade.
#
# New method, but need many more.

PLXWin.tcl:
# Removed a lot of the miscellaneous init garbage, now handled by
# plw_setup_defaults.
#
# Eliminated use of client variable and fixed plw_create_TopRow syntax.
#
# Fix to fix of key bindings.
#
# Fixed key bindings.
#
# Inserted initialization of zoom windows lists.  Gross, but it should
# work.

plclient.tcl:
# Tweaks to exit handling.
#
# Offloaded the C code for cleaning up from tk.c into the proc
# plclient_link_end in plclient.tcl.  The Tcl code was modified to better
# handshake with plserver.

plcolor.tcl:
# Changed to use new Palette file selector.
#
# Implemented new cmap1 selector to handle additional control point
# attribute.  Improved widget layout some.

pldefaults.tcl:
# Set zoom starting point to default to center.  Better for zooming in on
# small plot features, although worse for large objects (e.g. entire plots).
#
# Added global variables for setting defaults for zoom and save options.
#
# Fixes for Tk 4.0.  The default options in the options database changed in
# some cases so that apps look the same as before.  Users can change these
# to taste.  The test for mono system using the line
#      if {[tk colormodel $w] == "color"}
# (this command was eliminated) has been replaced by
#      if {[winfo depth $w] == 1}
# which has the same effect.
#
# Revamped modifier key acceleration scheme.  Now controlled by two global
# variables: "global key_scroll_mag", which defaults to 5 and is the
# magnification for each modifier key added, and "key_scroll_speed", which
# defaults to 1 and is the baseline speed.  I probably should convert to
# using real resources for these; maybe for the next cut.
#
# Made a bunch of settings global.
#
# Changed print key to "P" because it's too easy to hit by mistake.

plserver.tcl:
# Offloaded the C code for cleaning up from plserver.c into the proc
# plserver_link_end in plserver.tcl.  The Tcl code was modified to better
# handshake with the client (plplot TK driver) program.
#
# Some cleanup code at exit moved into plserver.c, and the exit_app proc was
# eliminated (in favor of just exit).

pltools.tcl:
# Added procs getSaveFile and getPaletteFile for retrieving a save or palette
# file name, respectively.  Checks to see if [incr Tcl] is available and if
# so, uses the non-sucky file selector.  Otherwise uses the getItem proc.
# Added modified destroy proc by Michael J. McLennan, to ensure that [incr
# Tcl] objects get destroyed properly.
#
# Fix for Tk 4.0.  Lines of the form
#      if {[tk colormodel $w] == "color"}
# no longer work (the command was eliminated), and have been replaced with
#      if {[winfo depth $w] == 1}
# which has the same effect -- to determine if we are on a color or mono
# system.
#
# Allow exec's since some people need them.  Shouldn't be a problem unless
# you compile TK without security (don't do this).  If you have a problem
# running the plplot/TK driver using Xauthority style authentication, use
# the Tcl-DP driver instead.

plwidget.tcl:
# Set zoom starting point to default to center.  Better for zooming in on
# small plot features, although worse for large objects (e.g. entire plots).
#
# Changed to call getSaveFile to retrieve save file name.
#
# Split up the plot-menu building code into different procs and rewrote
# substantially.  Save menu changed: the device is now specified as an option,
# with all Save-As.. selections going to this device.  A file type option
# was added, to select between 1 plot/file (the default) and many plots/file
# (archive files).  Intended to reduce errors caused by forgetting to close
# the save file.  The Again and Close commands are now disabled unless an
# archive type save file is open.  Zoom menu changed: forward/back entries
# added, to go forward or back one zoom level.  Disabled if it's not possible
# to do so.  Zoom options added: preserve aspect ratio (check button), zoom
# starting from corner or center (radio button).  Default is to zoom from
# one corner, preserving aspect ratio.
#
# Changed the way the client variable is treated.  If specified, enables
# settings relevant to working with the plplot/TK driver.  To simplify the
# code, the client variable is now kept globally and not passed as an argument
# so some proc syntaxes were changed.  Also, this forces only 1 plplot stream
# per plserver process (I doubt anyone has tried to do otherwise anyway).
#
# Key filtering changed to new modifier magnification scheme.  Changed style
# of reports (of keypress or mouse events) back to client code in order to be
# more complete.
#
# Default zooming behavior changed -- now it zooms outward from the center
# (first point clicked on), preserving aspect ratio.  This works correctly
# even if the orientation or the aspect ratio is changed.  The old behavior
# can be recovered by setting the global variable "zoomopt" to 1.
#
# Several important additions to the zooming capability:
#  - A double click now zooms by 2X, centered at the mouse cursor.  If the
#    cursor is too close to the boundary to allow this, an appropriately
#    higher magnification is used.
#  - The zoomed window positions are retained and can be recalled.  The keys
#    "b" (backward) and "f" (forward) are used to traverse the window list.
#
# Added a status message while waiting for plot to print.

tkdemos.tcl:
# New front-end demo file for use from plserver.  It uses the same example
# program files as pltcl but passes the name of the widget.

xtk01.c:
 * Change to header file inclusion: to get PLplot/Tk global function
 * prototypes, must now include pltk.h.  Some cleaning up and resource leaks
 * plugged.
 *
 * Changed one of the plots to a plshade demo, in order to make it easier to
 * investigate cmap1-related behavior when the widget is being driven directly.
 *
 * Modified to use the new syntax for pltkMain().

xtk02.c:
 * Change to header file inclusion: to get PLplot/Tk global function
 * prototypes, must now include pltk.h.  Some cleaning up.
 *
 * Modified to use the new syntax for pltkMain().

xtk04.c:
 * Change to header file inclusion: to get PLplot/Tk global function
 * prototypes, must now include pltk.h.  Some cleaning up.
 *
 * Imlemented plshade from Tcl.
 *
 * New Tk demo to show off the 2-d api.

-----------------------------------------------------------------------------
utilities
-----------------------------------------------------------------------------

plrender.c:
 * Changed debugging output to use pldebug().  Updated option tables to
 * eliminate references to PL_OPTION_ENABLE.  Changed some color setting
 * commands to go through API functions plscol0n() and plscol1n() since now
 * these do real work.
 *
 * Added termination in case of bad arguments.
 *
 * Fixed up Copyright and other cleaning up.  Converted to new style argument
 * list merging, resulting in a substantial reduction in lines of code -- the
 * old -h and -showall plrender options and many routines associated with the
 * old way are no longer necessary.  The keyboard event handler was upgraded
 * to use the new PLGraphicsIn structure.
 *
 * Changed exit code to 0 when a -h or -v is encountered -- better for shell
 * scripts when you just want to check the version number.
 *
 * Changed to new "merged" style of option table parsing.  Rewired command
 * line handling so that now any number of metafiles may be specified (note:
 * driver is reinitialized with each file, however).  Options now only apply
 * to files they precede on the command line.  Help and usage messages
 * changed accordingly.  Bug fix: the background color specified from the
 * command line now properly overrides the setting in the metafile header
 * (color changes in the body of the metafile not affected).
 *
 * Fixes to allow plrender to work better with old and/or mangled metafiles.

pltek.c:
 * A small patch to remove a "==" assignment introduced last-time and removed
 * an unused variable picked-up by gcc -Wall.  Contributed by Mark Olesen.

tektest.c: (new)
 * Just a quick little Tek test program that I whipped up; it may come in
 * handy again.

-----------------------------------------------------------------------------
DOS drivers
-----------------------------------------------------------------------------

DOS/EMX changes, by Mark Olesen:

  The configuration package for emx/gcc on a dos system.  Not many
  changes, from the last submission, but it appears that a vast majority
  of the files were /not/ unpacked properly for inclusion in version 4.99i.
  [it turns out I forgot to check everything into CVS -mjl]

  The emx distribution has both batch and shell script files `mkmf' and
  `link'. It is intended that the shell scripts be executed on a Unix
  machine to create the Makefiles and copy all of the requisted files to
  the ./tmp directory.  After this stage, the Unix drive may be NFS
  mounted by the DOS machine and the rest of the make may be finished
  there in a DOS environment. I find the NFS option to be quite
  convenient. 

-----------------------------------------------------------------------------
Amiga driver
-----------------------------------------------------------------------------

** STILL NEED TO DO THIS ** -mjl

-----------------------------------------------------------------------------
Miscellaneous
-----------------------------------------------------------------------------

stndfont.c:
 * Eliminated SCHAR in favor of simply "signed char".

xtndfont.c:
 * Eliminated SCHAR in favor of simply "signed char".

