greater commit than expected. informations from tank now stored into database; introduced a new switch "--recreate-database"

reactivated fallback and callback from lqs, fixed multiple lineins on engine level, having the problem that fallback does not start

checking free diskspace. send warnings (email & logging) and stop recorder if a critical value is reached.

found stupid bug in fetching programme from pv. added more or less random playlists. almost reactivated whole chain from fetching to liquidsoap