[seul-edu] seul-edu digests work!

[Roger R Dingledine <arma@mit.edu>]

I finally fixed the last (heh) bug. Digests are functional
for seul-edu. Send mail to majordomo@seul.org with a body
of 'subscribe seul-edu-digest'. In theory, every so often
(it's configurable by me, I haven't settled on a good value
yet) you'll get a clump of list messages.
Enjoy,
--Roger