[Distutils] Simplify 426: Deprecate Author-email and Maintainer-email

[anatoly techtonik]

Having a lot of meaningless options doesn't make meta data any more clear.
Well, they are not meaningless, but their role is fully fulfilled by other
options (Author and Maintainer fields in this particular case).

The use case for the Author field is that if Author wants to be contacted,
(s)he leaves email. That's it. This use case should be described in the
meta-data along with the format that are expected to be recognized by the
software:

Author: anatoly techtonik
Author: anatoly techtonik <techtonik at gmail.com>
Author: anatoly techtonik <techtonik at gmail.com>, Anything Else for Humans,
Or For Future Specs

Here the field content defines its type - it's like duck typing for
specification, which make specifications more pythonic.

Is it good?
-- 
anatoly t.
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