updated pixel, compute bit allocation at runtime, weight operations in
order to try usual "winners" more often, increase RGB allocation size.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@3520 92316355-f0b4-4df1-b90c-862c8a59935f

Twitter, rendering this service slightly more useful. It's still full of
crap, of course.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@3518 92316355-f0b4-4df1-b90c-862c8a59935f