This is a bash script to go through the archives of a list and report
number of posts by month, year and total as well as a rough report of
total post size by month.

The script was contributed by Alain Williams <addw@phcomp.co.uk>
and has been slightly modified by Mark Sapiro <mark@msapiro.net> to
run with only read access to the archive and to remove the perl
dependency.

The original from Alain is at
<https://mail.python.org/pipermail/mailman-users/2014-February/076106.html>.

Both versions work only with archives whose archive_volume_frequency
is Monthly.