/unban [\<channel\>] [\<usermask\>] [\<usermask\>] ...
*
Removes a ban for the given usermasks on the given channel.
If no channel is given, the current channel is used.
If no usermask is given, the current bans are listed.
The bans will be removed 3 at a time.
*
/unban \*!\*@\*acorn.co.uk
*
would unban anyone in the domain 'acorn.co.uk'.
