[issue9507] namedtuple should not hardcode the class name in __repr__

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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stage:  -> patch review
versions: +Python 3.1, Python 3.2 -Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9507>
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