[issue7048] decimal.py: logb: round the result if it is greater than prec

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

There's a restriction on the second argument to scaleb in the spec, 
namely that scaleb should be in the range -2*(Emax + precision) to 
2*(Emax + precision) inclusive.

This restriction seems entirely arbitrary and unnecessary to me.  My
guess is that it's there to ease implementation in low-level languages, 
but it makes little sense for the Python implementation.

Here's a patch that removes this restriction on scaleb in the Python 
implementation, and skips the corresponding tests.

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Added file: http://bugs.python.org/file15411/scaleb.patch

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