Made sip_subscribe_rls show an error when use_presence_agent is False

darcs-hash:20081126154348-1e3d8-fb63eeddeaf7ffff5ac6616eb585191f09328617
Fixed import in sip_subscribe_winfo

darcs-hash:20081126154457-1e3d8-370bbbb6b235adf3600e302e756ea3ca9c6e51e2