Syntax: %bUNBAN <channel> [ALL]%b

Unbans every ban matching your user@host on <channel>.
If you specify ALL, every ban on <channel> will be
cleared.  You must have SuperOp access to <channel> to
use the ALL option.
Examples:
         %b/msg %C UNBAN #channel%b
            Clears every ban on #channel matching your
            hostmask

         %b/msg %C UNBAN #channel ALL%b
            Clears every ban on #channel. (Must be
            SuperOp on #channel).
