mod_muc_moderation: Copy XEP-0421 occupant-id from retracted message Lets clients correlate the sender of whatever was retracted by moderators. Behavior limited to Prosody 0.12, otherwise there are no assurances of the origin of the occupant-id tag. Ref #1816

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summary: Log a message once per minute
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This module sends `-- MARK --` to the log once per minute. This may be
useful to give a sense of how busy the server is or see that logging and
timers are still working.