[issue7365] grp and pwd should treat uid and gid as unsigned

[Mark Lawrence]

Changes by Mark Lawrence <breamoreboy at yahoo.co.uk>:


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components: +Library (Lib) -Extension Modules
stage:  -> patch review
versions: +Python 2.7, Python 3.1, Python 3.2 -Python 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7365>
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