bug#49869: [External] : bug#49869: Revert buffer? Yes/No/Maybe

[Drew Adams]

> > under a different name (at least for the user option)
> > to avoid confusion with the `revert-buffer' command.
> 
> Maybe revert-buffer-quick?

This is the real revert-buffer-quick.  I bind it to F5,
as that's the key for this everywhere in MS Windows.

 (defun revert-buffer-no-confirm ()
   "Revert buffer without confirmation."
   (interactive) (revert-buffer t t))

And no, we shouldn't have sacrificed `C-x g' for global
buffer reverting.  Anyone could bind such a command; no
need to waste another key by default.