Version bump
Remove idea of "disambiguated location" on double chest. Will use two locations from now on.
macros on version
Add a utility function for finding the other half of a double chest
Dependencies no longer required
Function to copy lock information from one block to another. Used for double chests.

Could be used for other blocks, perhaps using a user command, in future.
Don't treat destroyed half-chests specially, they're now individually locked
Keep other half of a chest up to date on lock, unlock, place or change
Add some new lockable block types for 1.8