[issue6715] xz compressor support

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> The entry in Misc/ACKS, Doc/whatsnew/3.3.rst and the commit message
> should be enough.  Lately I’ve noticed some attributions in NEWS, but
> it’s usually not done (as redundant).

I generally add attributions in NEWS since that's where most people
learn about changes (for changes which aren't in whatsnew).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6715>
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