[issue18606] Add statistics module to standard library

[Steven D'Aprano]

Steven D'Aprano added the comment:

Since I can't respond to the reviews, here's a revised patch. Summary of major changes:

- median.* functions are now median_*
- mode now only returns a single value
- better integrate tests with Python regression suite
- cleanup tests as per Ezio's suggestions
- remove unnecessary metadata and change licence

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Added file: http://bugs.python.org/file31354/statistics.patch

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