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)
Implement ItemMergeEvent; Addresses BUKKIT-1959

Minecraft 1.3 added a feature to automatically merge items close to each
other. This event signals listening plugins when this occurs and allows
for cancellation of the event if desired.
Fix comment spacing
What's in _a_ name?  That which we call a merge...