(_find_dup) New routine.  For subscribers of class "unique," check
the subscriber lists of lists to which a message has already been
posted.  Any such subscriber with a mode other than "nomail" on
one of the other lists will not receive a duplicate.
(_post)  Cease relying on the message headers to determine the
archive date.  Instead, use the time of arrival.
(_within_limits)  Fix off-by-one counting errors.
Add comment about "unique" mode.
(get_matching_quick) Enclose regex in quotes.
(_post)  Update post database before delivery.  Requested by SRE.
capture example use, as posted on the developer's email list
fix obsolete notes about maintaining MTA aliases
Fix problems with max_mime_header_length == 0.
Indicate the elapsed time for the command.
(dispatch) Fix untainting typo.  Track the elapsed time for a request
and provide it to inform().  Call inform() on *_done commands, and
not on *_start commands if they succeed.
(report) Display the elapsed time if known.
(inform) Record the elapsed time.
(_inform_owner)  Make the elapsed time available through
the TIME substitution.
(elapsed) New routine.  Return the elapsed time since the first
call to in().
(elapsed) New routine.  Does nothing.
clarify differences between two similar-sounding commands
tried to add some notes about cron and triggers and mj_trigger,
not sure this is right and would appreciate careful review!
document special handling of X-Loop header
cross reference two ways to add the same header
add SUBSCRIBED variable and update list of variable
substitutions as per Jason's post (still some files not documented)
negation of regexps now works, at least in some places
cross reference two ways to remove the same header