grass CELL -> ppm?

[James Darrell McCauley]

Bill Brown (brown at zorro.cecer.army.mil) writes on 21 Mar 94:
>I forgot about r.out.tiff & went ahead and wrote a r.out.ppm - oh, well,
>if anybody wants it, it's on moon in grass/incoming.

probably a better option to have since pbmplus is distributed
in src.related (the "two step" conversion philosophy). I.e.,
since we have pbmplus, there's no need for r.out.gif, r.out.tiff,
r.out.pict, etc.

--Darrell