* pnmtopng: fix bug: with -alpha specifying a mask which contains
no fully transparent area, output PNG is fully opaque.
Introduced in 10.29.
* pnmquant: work with older Perl that doesn't have 3-argument open.
* pnmtops: fix message: says "from top edge" where it means
"from bottom edge."
* pgmtexture: fix wrong sum variance result. Wrong since the
beginning. Thanks Francois P. S. Luus <fpsluus@gmail.com>.
OBS-URL: https://build.opensuse.org/package/show/graphics/netpbm?expand=0&rev=31
Petr Gajdos
9d00062359