Updated the uninstaller to remove datastore entries in Alpha 4.
Unfortunately due to a bug in vBulletin, it still won't work if you use Xcache, Memcached, or APC integration in the vBulletin config file. In this case (uninstalling and reinstalling), the user will have to manually expire their opcode cache. We intend to add native support to VaultWiki for these caches (which may workaround the issue), but that is a low priority during Alpha.