[issue6715] xz compressor support

[Antoine Pitrou]

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

> Apart from this, is there anything else that needs to be done before this
> change can be committed to the main repo?

Things look fine to me, apart from a couple of minor comments I've made on the review tool.

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