fix issue where framegroups with no poses were causing a crash. now causes spam.
implement sneaky trick to munge lightmaps a little, greatly accelerating stuff like sock's map.
fix q3 physics issue (was probably bugging out q2 too).
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@4922 fc73d0e0-1445-4013-8a0c-d673dee63da5