sk89q/worldedit — pull request #213 by Meaglin (2012-11-03 03:00:20+00:00)
Title: Restore usage of Pre-Anvil chunks.

The change of mca -> mcr and mcr -> mca was needed because somewhere along the line the base extension of chunks was changed from mcr to mca which broke this temp-fix for usage of both chunk types.
This fix is needed to allow people to use their old backups again instead of making them seem corrupted.