testing changes to the list bridge

I just installed some changes I made yesterday to the list bridge—in particular, this should solve the problem with multipart/alternative messages that Tim and Michael were having, as well as the various character encoding problems that were popping up.

This message is to tell you this, as well as to test whether the bridge works after the changes.

There were some lingering problems in the list-to-forum direction. I believe those are fixed now.