Update pstoedit to 3.50.

While here, remove restriction, it's "please", not "have to".
 see: http://packages.debian.org/changelogs/pool/main/p/pstoedit/pstoedit_3.45-8/pstoedit.copyright

New or changed in 3.50:

    * added an option (-gs) to specify the full path to GhostScript (under
      Windows - either the .exe or the DLL). This can be used by portable
      applications to direct pstoedit to use a specific GhostScript version.
    * Stanislav Brabec contributed several improvements to the PCB driver. See
      http://www.penguin.cz/~utx/pstoedit-pcb/ on how these can be useful.
    * Scott Pakin submitted several improvements to the mpost driver and the
      font substitution mechanism.
    * new driver for .vtk files e.g. for ParaView - http://www.paraview.org/
      - but this is still a very basic version. Thanks to Mitesh Patel for
      initiating and testing.
    * new driver for cairo (http://cairographics.org/ ) contributed by Dan
      McMahill. This driver generates C-code which can be compiled and linked
      against the cairo libraries. See the contrib/cairo directory for an
      example.
    * several improvements on the DXF driver as suggested and sponsored by
      Markus Meyer.
    * because pstoedit may write its output to stdout, all output written by
      GhostScript to stdout is now redirected to stderr in order to avoid mixed
      output.
    * added a -q option to suppress the initial startup message of pstoedit.
      This can by useful when being called via a pipe, e.g. from inkscape.
      However, note that this does not suppress all output written to stderr -
      see also note above.
    * John Bowman fixed a number of problems related to clipping and image
      support for the Asymptote backend.
    * fixed a compilation problem with g++ V4.x.
    * new driver for gcode (.ngc files) (tested with emc see
      http://linuxcnc.org). Contributed by Lawrence Glaister.
    * some adaptations for newer versions of libming
    * fixed a line width problem for xfig format.
    * corrected the broken pstoedit.m4 - thanks to Ian Abbott
    * some minor code beautifying.

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