Support for disconnected operation with server side flags

1999-06-12  Simon Josefsson  

        * gnus-agent.el (gnus-agent-group-mode-map): New key binding, `J Y'.
        (gnus-agent-synchronize): New function, synchronize flags with server.
        (gnus-agent-fetch-group-1): Check server connection.

        * nnagent.el (nnagent-request-set-mark): Save flag setting
        requests.

Non-HTML diff style patch for PGnus 0.86