Add methods to check conflicting enchantments. Adds BUKKIT-3830
Allow fishing success rate to be adjustable. Adds BUKKIT-3837
Call EntityChangeBlockEvent when boats destroy blocks. Fixes BUKKIT-3871
Allow plugins to enchant already enchanted items. Fixes BUKKIT-1956

This causes the server to generate PrepareItemEnchantEvent even in the
case that an item is already enchanted or otherwise would normally not
be enchantable.
Add missing semicolon

I should try to compile before I say "this change is okay".
I should try to compile before I say "this change is okay".
I should try to compile before I say "this change is okay".
I should try to compile before I say "this change is okay".
for i in range(100)
Improve calling of ProjectileHitEvent. Fixes BUKKIT-3872