Equipment in players' inventories persistant

-When the server is shut down and restarted, or a player quits and
rejoins, any equipment contained in the player's inventory is now
properly saved and reloaded.
equipment in inventory bugfix

-fixed a potential leak created by old equipment definition files
hanging around.  They now clean themselves up each time they are
written, so the directory only ever represents what is actually in the
player's inventory.