* Remove feature: columns listed in tree view (helps fix repeated queries; need to cache these and move to different GUI location)
* Remove feature: SELECT COUNT(*) on all tables with MySQL < 3.23 (performance killer)
* Add feature: Cache table lists for tree view (improves performance and fixes repeated queries)
* Add feature: Master refresh button clears entire table list cache.
* Add feature: Refresh button in table list view popup clear table list cache for database being viewed.
* Add feature: Restore active database after user queries.