- Added function BMSkill*::incompatible_attack_types()
- Added logic to BMAttack->add_die() to check whether the die can perform such an attack
- Added test case to check whether a skill attack can be found when the attackers are berserk dice
Merge pull request #283 from blackshadowshade/272_berserk_skill_attack

Basic tests pass --- i added Bruno to my set by hand and verified no skill attacks were offered, but that a die without berserk attacks could still do a skill attack.