Added SCSessionGotStreamUpdate notification to Session

darcs-hash:20090325165128-58103-188077066ef9acd45154fb2118d50cfb613099c8
Set codec list from account as global in sip_audio_session.py

darcs-hash:20090325175553-58103-0ce40a5ff506e053ab1c7ba61d26865fca2c2f9f