Flush stdout in sip_audio_session.py on every loop iteration

darcs-hash:20090415082337-58103-5a44de585653b910ebe7b3731327a7ba43143e5c
Make -S use dummy device is sip_audio_session.py

darcs-hash:20090415083618-58103-8c0bc1283fb7323dfa783dea908d4e06ce04b352