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

got too many data from pv. data is now filtered => easier debugging. now it is only possible to comment this to disable this function

This reverts commit 62a8c7ba, reversing
changes made to a9c94736.

several things: critical socket threading bug from comba resolved. adapted interfaces to pv / tank / database

fixed the commit bug. one does not have to add a already existing object in the database to the session.