Fixed issue where you couldn't remove your buffs.

Fixes:

Traceback (most recent call last):
File "scripts/commands/removebuff.py", line 8, in run
buffObj = actor.getBuffByCRC(int(commandString))
AttributeError: 'resources.objects.creature.CreatureObject' object has no attribute 'getBuffByCRC'
Fixed Incap weaken immortality bug
Added cell-relative AI patrol motion

- Replaced unnecessarily complex algebraic matrix expression
Merge pull request #1193 from CharonInferar/MoreFix

Fixed Incap weaken immortality bug
Fixed minor visual bug with buffs from frog.