Log Message:
Changes 10.29:
Add ppmdraw.

Add pammixinterlace.  Thanks Bruce Guenter <bruceg@em.ca>.

Add pgmmedian.

Add pnmaddnoise.

pnmtopclxl: add -rendergray option.

pnmtopclxl: add -jobsetup option.

pstopnm: add -dSAFER Ghostscript option.

pnmcrop: add -margin option.

pnmcrop: add -borderfile option.

pnmnorm: add -luminosity (which was already default),
-colorvalue, and -saturation.

pnmtopng: Don't include any alpha info if supplied alpha mask
is all opaque.

ppmcie: Make white point mark more visible.

pamdice: Remove restriction of 100 slices in each direction.

pnmtopng: Fix bug: erroneous transparent pixels when supplied
alpha mask is all opaque.

Fix bytesToWordInt(): converts incorrectly on a machine that
has pointer size != word size and uses the general case code.

libnetpbm: fix basic pm_readlittleshort() bug introduced
in 10.27.  Affects mdatopbm, rawtopgm, lispmtopgm,
pcxtoppm, winicontoppm, bmptopnm, sirtopnm, xwdtopnm,
cameratopam.

pamlookup: fix universal crash.  Thanks "Colley, Anthony
W." <Anthony.Colley@ngc.com>

pbmtolj: fix bug from 10.28: crashes with a line which is
a multiple of 8 plus 7 pixels wide not counting white right
margin.

ppmtompeg: fix uname() rc test (sometimes > 0 is success).