7.47: fixed LUSERS always saying "x users and y invisible on 0 servers."
            fixed LUSERS always saying "0 channels formed."
            added oper notice format registration methods to the pool object.
            created OperNotices API base for registering new notice formats in modules.
            created Core.OperNotices module for oper notice formats used in the core.
            created oper notice flags: new_connection, new_user, new_server.
            added notice() utility function for quickly firing oper notices.
            added 'notices' option to oper and operclass blocks in configuration.
            the notice flag 'all' instructs the server to send all notices.