[issue1076515] shutil.move clobbers read-only files.

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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stage: unit test needed -> 
type: behavior -> feature request
versions:  -Python 2.7, Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1076515>
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