[issue5411] Add xz support to shutil

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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assignee:  -> serhiy.storchaka
dependencies:  -Misc fixes and cleanups in archiving code in shutil and test_shutil

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5411>
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