Fixes date parsing error with NZBClub
Fixes error when items are not found on NZBClub
Only updates TVDB database once a day. When a series is being updated on TheTVDB it can be marked as updated various times. If we only update once a day this will mean we will usually update the information only once and not with each episode search.
If an episode air date is greater than seven days and the episode is not found it is marked as downloaded to avoid searching in the future.
This fixes an issue where shows are selected to downloaded that aren't available, plus lots of episodes that won't exist. DVD extras, Web Episodes are usually marked as season zero. Every unfound search on NZB Matrix takes a minute due to their API waiting 30 seconds between calls.
Known issues.
Have multiple search selections that are no longer valid (SpearNZB search, TVNZB) can't remove them due to crashing the database if they are in use.