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

[Leif Walsh]

Leif Walsh added the comment:

Here is a patch for #1.  I ran make test, and nothing was broken that
seemed to be my fault, so I assume it's okay.

Yes, it's small, it's my first one here.  I'll get to the other two
tomorrow.

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nosy: +adlaiff6
Added file: http://bugs.python.org/file9159/structseq_subclasses_tuple.diff

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