Issue #9850: Fixed macpath.join() for empty first component.  Patch by
Oleg Oshmyan.

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#20974: Update version table in email intro.

Note that the email version string in 3.3 and 3.4 is inaccurate, since it
still exists but wasn't updated while the code was.

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Issue #16537: Check whether self.extensions is empty in setup.py.

Patch by Jonathan Hosmer.

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#18854: make it explicit that is_multipart does not mean 'multipart/xxx'.

Original patch (and the idea of using _structure) by Abhilash Raj.

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Merge heads.

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Issue #22251: Fix ReST markup to avoid errors building docs.

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#10510: make distuitls upload/register use HTML standards compliant CRLF.

Patch by Ian Cordasco, approved by Éric Araujo.

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Revert #22251

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