Cleaned up email archives

[Robin Lee Powell]

All of the Lojban-related mailing list archives (which are very
incomplete in a few notable cases, like wikidiscuss, but are
believed complete for the important things like lojban-list and
-beginnings and the llg- lists) have had their raw files cleaned up
and now have a zip archive, which in the case of the still-active
lists is updated daily. This is all at
https://mail.lojban.org/lists-plain/