[issue1623] Implement PEP-3141 for Decimal

[Jeffrey Yasskin]

Jeffrey Yasskin added the comment:

I think this reflects the consensus of
http://mail.python.org/pipermail/python-dev/2008-January/075798.html. I
haven't yet implemented Context.round() as I suggested at
http://mail.python.org/pipermail/python-dev/2008-January/075920.html
because there are more details to discuss, and I don't want to sidetrack
the discussion about basic PEP 3141 support.

The test currently fails due to issue 1747. I'll double-check that it
passes once that's fixed.

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dependencies: +isinstance(NotSubclassOfObject, InstanceOfAbcMeta) fails instead of returning False
Added file: http://bugs.python.org/file9080/decimal-3141.patch

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