no more Subject: prefix for tug.org lists

(Apologies to those of you who see this many times.)

FYI, I've removed the "[...] " prefix from the Subject: header for this
mailing list's messages. This has become necessary because of draconian
DMARC/DKIM/ARC rules now imposed by Apple, Microsoft, Yahoo, etc.

The List-Id: header identifies the mailing list for purposes of
filtering messages, etc. I know that is less convenient, but that's life.

This was already done on a number of lists, and now it's the case for
all lists on tug.org, as has been the case on gnu.org and other sites
for some years. --karl