[issue5411] shutil should support all formats supported by tarfile automatically

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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title: add xz compression support to shutil -> shutil should support all formats supported by tarfile automatically

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