http://ftp.xemacs.org/beta/incoming renamed to `experimental'

The name `incoming' has traditionally been used to name anonymously-writable directories at ftp sites. Since the climate of trust on the Net has sadly changed for the worse, public ftp sites can no longer provide such directories. So the name is no longer a good one. At Ben's suggestion, I have renamed the directory to `experimental', since that seems to better describe its contents. I've also created a beta/tmp directory that I personally use when uploading new betas. I completely upload all the files for a beta to tmp, then move them pretty much instantaneously to beta/xemacs-21.2. This avoids problems with people accidentally downloading a beta while I'm still uploading it. Vin and Andreas, if you ever have too much free time on your hands, you might consider implementing the same thing. See `xre' in the xemacs-builds module. Martin