Fixed the sellAnnouncement permission, which was not correctly taken into account.
Fixed loading of messages and saving new values of messages. The plugin will no longer write to your configuration if it already exists, but only add if it does not exist.
Added a backup system of the items.json file. By default the file will be backed up every day at 00:00. If you want to have more control over when saving the file you can use the zScheduler plugin. An implementation was added in zAuctionHouse to support zScheduler.