bug#21947: 24.5; epa: option for always replace encrypted text without asking

[Daiki Ueno]

Christian Schwarzgruber <c.schwarzgruber.cs@gmail.com> writes:

> I made all the changes, hope I did it the way you guys want it (see
> inline patch).
>
> I tested all possible options, with `epa-decrypt-region', as well as
> epa-verify-region.

Thanks.  I have modified it a bit (to accept any symbol value for "ask")
and pushed it to the git master, assuming that the change is small
enough not to require copyright assignment.

Since this is a self-contained change, is it okay to push it to
emacs-25?

Regards,
-- 
Daiki Ueno