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

[Raymond Hettinger]

Raymond Hettinger added the comment:

Thanks for the patch.  I removed the whitespace changes and added some
tests to make sure structseq now works with the % formatting operator
and isinstance(t,tuple).

Am getting a sporadic segfault in test_zipimport when running "make
test", so holding-off on applying:

test_zipimport
~/py26/Lib/test/test_zipimport.py:91: ImportWarning: Not importing
directory '/home/rhettinger/py26/Modules/zlib': missing __init__.py
  ["__dummy__"])
make: *** [test] Segmentation fault

Added file: http://bugs.python.org/file9170/structseq.diff

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