9.26: all outgoing command handlers now have the first argument $server.
            they can also return array refs of multiple lines to send.
            server burst events are fired per-protocol as send_$PROTO_burst.
            BURST and ENDBURST moved from ircd::server to JELP::Outgoing.
            fixed bug where server description starting with colon would lose the colon.
            implement TS6 registration commands PASS and SERVER.