Update to plotutils-2.3. Changes include:

- PNM driver added, which outputs PBM/PGM/PPM format.
- CGM support added, By default, a CGM Plotter produces
  binary-encoded version-3 CGM format, which conforms to the WebCGM
  profile.
- pseudo-GIF driver added, using miGIF run-length encoding routines
- text string format now supports "\fP" macro for switching to
  previous font (cf. troff; "\fR", "\fI", "\fB" supported too).
- libplotter: new C++ library.  Provides base Plotter class, subclasses for
  the different sorts of Plotter.
- new "dotdotdashed" line style added
- new thread save C/C++ API added (old API still supported)
- pic2plot: new utility, which can translate the pic language to any supported
  graphics format, including X11.
- new function pentype() added to the API.
- many bug fixes.  See the file 'NEWS' in the source distribution for a
  complete list (a couple of pages).

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