[Patch] Add C++14 feature querying macro `cxx_digit_separators` describing support for "Single-Quotation-Mark as a Digit Separator"

[Michel Morin]

Richard Smith wrote:
> I was thinking we should just say:
>
>   Use ``__cpp_digit_separators`` to determine if support for digit
> separators using single quotes (for instance ``10'000``) is enabled.

OK, done. Patch attached.

Regards,
Michel
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