James D. Callahan III:
	- Added 21 more mappings from Item ID to NPC ID.
	- Added beginnings of a mapping from Item ID to NPC ID for the cases where the item name doesn't match the name of the pet it teaches.
	- Removed Hooks.lua. Also, in the previous commit, added detection of known and unknown for old-style pet items.
	- Clear all button tooltips and remove the OnEnter/OnLeave scripts when hiding the PetJournal frame.
	- Don't display a tooltip for pets that can't do battle.
