xpm-button, autoloads, etc

I have just committed a small number of minor changes to the 21.1 branch. Among the changes I made was the restoration of xpm-button.el. While doing this, I realized that lisp/auto-autoloads.el was out of date, and so I updated that file in my repository and checked in the new copy. While revisiting these issues, I had occasion to think about an email exchange which Martin and I had a while back. He suggested that I create lisp/mule/auto-autoloads.el and lisp/mule/custom-load.el files and add these files to CVS. I have now done that as well. Mule users: please try the out latest 21.1 CVS and let me know if you detect any problems. Thanks, vin