Add getShopEconomy() method to API
Add getGlobalShopAccount() method to API.
Fix Item display duplication due to chunk unloading.
Fix ghost InfoSigns, a few bugs.
Add "/removedisplay u" command to allow removal of displays in your
current vertical block column.  (same as prior method)
Make sure signKey isn't null when deleting InfoSign.
Protect TransactionSigns, InfoSigns, and Chest Shops while HyperConomy
is disabled.