(Fdelete_process): Undo 2004-05-28 change.

(Fdelete_process): Undo 2004-05-28 change.
Instead, call status_notify also for network process.
(status_message): Use process instead of status as arg.
Give messages "deleted" or "connection broken by remote peer" for
an exited network process.
(status_notify): Change call to status_message.
(read_process_output): Increase readmax to 4096.  Do not increase
buffer size for datagram channels (default is now large enough).