[issue1820] Enhance Object/structseq.c to match namedtuple and tuple api

[Santoso Wijaya]

Changes by Santoso Wijaya <santoso.wijaya at gmail.com>:


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versions: +Python 3.3 -Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1820>
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