mod_client_management: Allow revoking a specific client version Could be useful in case of a security issue affecting a particular version. Even if in that case, the more likely use case is revoking all older versions except the fixed one(s), this can be done with a loop or improved later.

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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.