Archives permissions problems are fixed

[Olav Vitters <olav bkor dhs org>]

The archives can now be read again (no 403 errors).

Background:
Umask in the archive.pl script was wrong. Initially I added a mhonarc
command line option (-umask 022), only this didn't fix the directories
created by the archive.pl script. Now the script itself also changes
umask to 022. A better fix would be to ensure the script that calls
archive.pl to have the correct umask, however this fix ensures the
permission problem never occurs again.

This fixes the archives permissions problems. If not, mail
mailman gnome org (patches preferred ;).
-- 
Regards,
Olav