Merge branch 'ps_to_jpg' into 'master'

Remove unused script ps_to_jpg.sh

See merge request graphviz/graphviz!1358

diff --cc doc/infosrc/Makefile
index efe90ef999e8191ad8dd64fc3bc1946ce332369b,394f18b04cf8671bcfcfe459cdba45550105e2c6..7a749cc8e24fb2fe07f11b35c70feff7c0287f8e
--- 1/doc/infosrc/Makefile
--- 2/doc/infosrc/Makefile
+++ b/doc/infosrc/Makefile
@@@ -2,10 -2,9 +2,9 @@@
  # Generator for on-line documentation.
  #
  # Required tools: cc, dot, awk, ksh, yacc, gs, python.
- #  gs and awk are used in ps_to_jpg.sh
  #  dot is used in mkarrows.sh, mkshapes.sh, mkstyles.sh, mktapers.sh, mksplines.sh
  #  ps_to_png.sh and other make rules rely on netpbm tools 
 -#  and ps2raster, which is part of the GMT library.
 +#  and psconvert, which is part of the GMT library.
  #  
  #  python is used to run jconvert.py, which converts the json schema
  #  graphviz_json_schema.json to html. This also relies on the python