[issue20630] Add sorting helpers for collections containing None values

[Nick Coghlan]

Nick Coghlan added the comment:

And in case that last comment worried anyone - I won't commit *anything*
related to this to the standard library until after creating a PyPI
"sortlib" module that includes both this and an "order_by_key" class
decorator, and we have consensus that the proposed changes are reasonable.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20630>
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