9.37: new server methods ->user_to_uid(), ->uid_to_user(), ->set_functions().
            fixed broken TS6 TMODE handler.
            fixed uid_from_ts6() misbehavior with UIDs containing integers in the "ID" portion.
            ->convert_cmode_string() now takes an $over_protocol argument. if true, it will attempt to convert UIDs from one protocol format to another.