bug#32939: 27.0.50; Don't reject confusable quotes, just fontify & mention them in error messages

[Noam Postavsky]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Noam Postavsky <npostavs@gmail.com>
>> Date: Thu, 04 Oct 2018 19:58:10 -0400
>> 
>> As a followup from [1], here is a patchset which replaces the master's
>> current rejection of confusable quotes on `read', and instead adds a
>> hint to the error message when evaluating an expression with a
>> confusable quote leads to an error.
>> 
>> And also highlight such quotes with warning-face.
>
> Thanks.  If this is accepted, it will need documentation changes,
> including NEWS.

I adjusted the first patch so it applies cleanly to more recent master,
and added a NEWS entry for the fontification.  I'm not sure about what
other documentation we need though.

v2-0001-Stop-signaling-an-error-when-reading-smart-quotes.patch
Description: patch

v2-0002-Improve-errors-warnings-due-to-fancy-quoted-vars-.patch
Description: patch