Update description of msrp relay setting

darcs-hash:20081128161024-58252-ec994dc71b0e15f26c8d91dbec47e22e60fdcd3b
renamed sip_im_send_file.py -> sip_send_file.py

darcs-hash:20081128161104-b2873-270e353204f57f69f3cc940262a2581294dec680