changed prompt from 'to ' to 'Chat to'

darcs-hash:20081126162438-b2873-30377c685d455f4baea625fdebeb8010d9d5124e
sip_im_session.py bug fixed: active session was not changed after msrp connection died

darcs-hash:20081126162625-b2873-9b2bfdc11949e0d9e0db72c54a5e8d5cf6641b1d