[issue15535] Fix pickling efficiency of named tuples in 2.7.3

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

Adding "def __getstate__(self): return None" to the namedtuple template fixes the issue.  Here is a patch with test.

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nosy: +amaury.forgeotdarc
Added file: http://bugs.python.org/file27131/namedtuple-pickle.diff

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