Stainless claws/doc

• Adds [(Unarmed Skill/2) up to a maximum of 4] cutting damage and [3 + (Unarmed Skill/2)] stabbing damage and per hand to unarmed melee attacks when fingertips are unobstructed.
• This works only with bare hands, not while holding weapons that work with unarmed attacks (e.g. the punch dagger).
• This stacks with other mutations and bionics that add damage to unarmed attacks.