boolean ircg_channel_mode
(resource connection, string channel, string mode_spec, string nick)
Set channel mode flags for channel on server connected to by connection. Mode flags are passed in mode_spec and are applied to the user specified by nick.
Mode flags are set or cleared by specifind a mode character and prepending it with a plus or minus character respectively. E.g. operator mode is granted by '+o' and revoked by '-o' passed as mode_spec.