UNRESV <channel|nick>

-- Remove a RESV on a channel or nick
Will attempt to remove the resv for the given
channel/nick. If the resv is conf based, the resv
will not be removed.

UNRESV <channel|nick> ON irc.server
will unresv the <channel|nick> on irc.server if irc.server
accepts remote unresvs. If the resv is conf based, the resv
will not be removed.

- Requires Oper Priv: unresv
