Allow "smtpctl show queue" to run in "online" mode if the smtpd server

is running.  The scheduler sends the runtime state of each envelope to
the queue process which loads the envelope, fills the runtime bits and
sends the envelope back to the client. Iteration over the envelope set
happens in small chunks to make the request interruptible and to allow
the server to keep doing its job in the meantime.

Adpat "smtpctl schedule-all" to schedule the messages one by one using
the same iteration mechanism.

Document "smtpctl monitor" and "smtpctl show queue".

ok gilles@

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