When a session loses a race to bridge a call, the CHANNEL_BRIDGE event
handler is still run, yet session_locate is going to return null as it
won't get a read-lock on the peer's session.  Since this is a normal
and common condition, let's log this as a debug message rather than as
an error condition.

Added optional core: prefix to first arg passed to freeswitch.Dbh for giving direct access to sqlite db

MERGE: OpenMethods ASR enhancements: multiple concurrent grammars and dialplan access to start-input-timers