Monkeys will now handle storage items like humans. It will be highly noticeable on clicking your backpack while it's on your back slot. It will actually open the contents instead of moving the backpack to your hand without a sound.
Aliens are not included to this change.
Removed the alien check on obj/item/attack_paw(), the "your claws aren't capable of such fine manipulation" little piece of code is now in obj/item/attack_alien().
Merge pull request #846 from Aranclanos/MonkeyBags

Monkey backpack movement fix.