pointer that was still in use

                        since this is a valid code path

                        Destroy the peer before the master channel

PROGRESS without PROGRESS INDICATOR IE is invalid according to Q.931,
so always call pri_progress() with info flag set, even if we do not
have media yet.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

fold the last round of sql manager changes back into the core and use it for the central db and simplify the algorithm