[issue1818] Add named tuple reader to CSV module

[Rob Renaud]

Rob Renaud <rrenaud at google.com> added the comment:

My previous patch could write the header twice.  But I am not sure about
about how the writer should handle the fieldnames parameter on one hand,
and the namedtuple._fields on the other.

Added file: http://bugs.python.org/file13188/named_tuple_write_header2.patch

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<http://bugs.python.org/issue1818>
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