I fixed a bug that occured when a player tried to repair an item using the anvil. The bug occured when a player increased the amount of the repairing material. For example, if a player tried to repair their pickaxe with one diamond but decided to add one more diamond, the durability of the resulting item would not take into account the second diamond, which resulted into the loss of the extra materials, without repairing the item even further! (only the first itemstack would get accounted).

I also added the permissions in the plugin.yml. From now on, players will have the overleveledenchanter.overleveledanvil permission by default!!!