[issue16113] Add SHA-3 (Keccak) support

[Christian Heimes]

Christian Heimes added the comment:

Please review the latest patch. 

I've included Gregory as he is the creator of hashlib.

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nosy: +gregory.p.smith
stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16113>
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