bug#19113: Generate a ChangeLog file from commit logs

[Stefan Monnier]

> Attached is a proposed announcement for installing the patch (currently it
> suggests a changeover date of January 21, but obviously that's adjustable),
> along with updated copies of the rename patch (which should be applied to
> both emacs-24 and master branches), a followup patch for the emacs-24
> branch, and a followup patch for the master branch.  This all tries to
> address some (though not all) the points raised.

If no one objects, go ahead,


        Stefan