Will try to reprocess _NzbDrone_ directories each pass, but will mark with an error when possible.
Attempt to process _UNPACK_ and _FAILED_ directories 30 minutes after first detected by NzbDrone (to give SAB time to unpack properly before processing).
Tests added to support new Statuses.
PostDownloadScanJob will update PostDownloadStatus for failed or unpacking.
ImportFile will set the PostDownloadStatus to Processed when added to the database.