 the PostScript
       and pdf conversion programs: converttopdf, converttops,
       convertfilestopdf, convertfilestops, convertsegfilestopdf,
       convertsegfilestops, imagetops, printimage and printsplitimage.

   (2) Programs that are used as regression tests in alltests_reg.
       These are named *_reg, and 100 of them are invoked together
       (alltests_reg).  The regression test framework has been
       standardized, and regresstion tests are relatively easy
       to write.  See regutils.h fo