[issue5411] add xz compression support to shutil

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

This not-so-bad patch adds lzma compression support to the shutil functions, under the 'xztar' name.  Please review.

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Added file: http://bugs.python.org/file24433/shutil-xz.diff

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