[issue1623] Implement PEP-3141 for Decimal

[Jeffrey Yasskin]

Jeffrey Yasskin added the comment:

Here's a version of the patch that uses _rescale instead of quantize. I
don't know enough about how contexts are used to know whether someone
might want to know that ceil(Decimal("1e30")) gave a result with more
precision than the input. On the other hand, the error .quantize()
throws is clearly the wrong one, so this is at least an improvement.

Added file: http://bugs.python.org/file8963/decimal_3141.patch

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