#43 PS twice-filtered by pstoedit

[Scott Johnston]

PostScript twice-filtered by pstoedit (-f idraw)
can't be read by idraw. The problem stems from the
fact that idraw format is PostScript made ready for
black-and-white printers, although the color
information is preserved for later retrieval by idraw.

So when pstoedit/ghostscript interpret the idraw,
they see only the gray-level raster, and output an
idraw format file without the color-image information
tucked into a comment.

Fixing this might take hacking on pstoedit as well as
ivtools (original raster support submitted by yours
truly). The workaround is to avoid applying pstoedit
to PostScript that is already in idraw format.