bug#10309: 24.0.92; [wishlist] Add an option to disable "auto-refining" while movingbetween hunks in diff mode

[Drew Adams]

> IMO, the info node "(emacs)Diff Mode" should explain the concept of
> "refined hunks" and also the `diff-auto-refine' minor mode.

+1.

And instead of just saying "make it writable first", say "make it writable first
(`C-x C-q')" to let newbies know how to do that.  That costs only a few extra
characters and does not interrupt the flow.