Fix for missing indexer_id during migration from other forks
Fix for missing column 'subtitles' during migration from other forks.
Fix for invalid literals when searching for episodes
Implemention option to start/stop full backlog thread
Merge pull request #427 from WebSpider/dev-backlog_startup

Implement configurable startup
Fixed main database structure to line up with original sickbeard structure so that migrating users get our database modifications migrated in without issues plus I've updated our main database structure to reflect all our recent changes so that new fresh installs dont have to go through the migration process
Fixed issue with main database migration numbering
Fixes issues with indexer_id never being added into tv_shows table when at a db version of 15 or higher
Fixes backlog and manual searches.
Fixes season pack and single/multi episode searches.
Fixes multi-threading issues.
Fixes incorrect status being reported for manual searches.
Fixes quality being returned as N/A all the time for torrents.
Fixed issues with added new shows not showing any episodes.

Fixed issues with duplicate downloads of the same season/episode caused by multithreading.
Merge remote-tracking branch 'sickrage/dev' into fix_proxy_390