[issue27353] Add nroot function to math

[Mark Dickinson]

Mark Dickinson added the comment:

[Raymond, quoting Matlab]

> in cases where both real and complex roots exist, power returns only the complex roots.

Yes, this would be the main motivation for me, too, if only to be able to answer the many StackOverflow questions like this one: http://stackoverflow.com/questions/30923838/how-to-get-the-real-cube-root-of-a-negative-number-in-python3

+1 for a private function in the statistics module for now.

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<http://bugs.python.org/issue27353>
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