21.0 release comments

I'm holding up creating the 21.0 release tarballs for two reasons. I have an unexplained bug-fix patch from Jan Vroonhof that I cannot trace to its origin. I need at least a ChangeLog entry before it can go in and I trust Jan enough to label it a showstopper until everything is in order. I'm going to rebuild all the Lisp packages from source and wish to have distributed package-get-base.el consistent with something. The following new packages are being added (unless there are serious complaints): comm/zenirc: IRC Client comm/irchat: IRC Client comm/mew: Internationalized MH-E replacement They've all been in the package-get-base for awhile now.