Unarmed weapons + stabbing + claw mutations
Disallows bio_cqb to buff claw stabs
Ditto for cutting weapons
Actually disabling it
Allow offhand claws to boost damage
Actually allowed offhand claws
Adds missing recipe.

We have this royal beef stuff in the comestibles file, yet there's no
way to access it. This fixes it.
More item descriptions
Continuous recipe learning
Prevent negative fatigue from heating the player up.
Make mutation activate/deactivate private, and make them accept mutation ids instead of indices.
Move toggling powered stat out of check for cooldown attribute.
Move code to deactivate mutation inside deactivate_mutation().
Merge branch 'unarmed-weap-stabcut' of https://github.com/Coolthulhu/Cataclysm-DDA into merge
Merge branch 'missing-recipe' of https://github.com/Rivet-the-Zombie/Cataclysm-DDA into merge
Merge branch 'item-desc' of https://github.com/Coolthulhu/Cataclysm-DDA into merge
Merge branch 'book-learn-recipe' of https://github.com/Coolthulhu/Cataclysm-DDA into merge
Merge branch 'fix-caffeine-overheating' of https://github.com/kevingranade/Cataclysm-DDA into merge
Merge branch 'fix-mutation-activation' of https://github.com/kevingranade/Cataclysm-DDA into merge
Fix minor typo.