[issue1965] Move trunc() to math module

[Jeffrey Yasskin]

Jeffrey Yasskin added the comment:

Go ahead and fix the docstring. I don't really understand what was
incorrect about the original "returns the integral closest to x between
0 and x", so I'm not confident that I'll come up with something you'll like.

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assignee: jyasskin -> rhettinger

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<http://bugs.python.org/issue1965>
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