Popmon

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* Extended the ``make`` commands (added ``make install`` and ``make lint check=1`` for check only).
* Add license headers to source files.

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* Several improvements aimed at new users, such as updated landing page, documentation and notebooks
* Performance improvement for weighted quantiles
* Consistent code formatting using black and isort
* Automatic release to PyPi on Github Release
* Platform agnostic file handling
* More informative exception messages

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* Released the first open-source version of popmon.
* Please see documentation for full details: https://popmon.readthedocs.io