Fixed some exceptions that could be thrown when an entire tribe of humans was killed
Added a Health Bonus to the Fight (Human) goal to try and stop healthy units fleeing so much
Added a "Hold Ground" goal plan to the Fight (Human) goal that does nothing - this hopefully keeps units from not having any valid offensive goals and falling back into defensive/fleeing (trying to stop the attack once and then run away combat pattern) - there might a better way to handle this, but it seems to be effective
Fixed units repeatedly trying to Return to Territory while they are already in their territory