Send a CTCP request to the given target.

def ctcp(self, target, ctcp_verb, argument=None):
        """Send a CTCP request to the given target."""
        # we don't support complex ctcp encapsulation because we're somewhat sane
        atoms = [ctcp_verb]
        if argument is not None:
            atoms.append(argument)
        X_DELIM = '\x01'
        self.msg(target, X_DELIM + ' '.join(atoms) + X_DELIM, formatted=False)