Improve ItemDisplay performance, ease of use, and correct bugs. (Item displays can now be made and removed by looking at a block instead of standing over it.)
Fix possible concurrency issues. Improved thread safety of most data structures.
Added option for players to change transaction sign stock by scrolling with mouse wheel.
Fixed use-shops options. (Global shops now should work.)
Made price InfoSigns default to the diamond enchantment class when no class is specified.
Updated the French language file. (thanks leagris)
