Mutmut

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* Another attempt to get the pypi package to work

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* Fixed missing requirement in install package

* Fixed missing file from the install package

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* Fixed bad entrypoint definition

* Ignore files that can't be parsed by `parso`

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* Missed a file in distribution, so `browse` command was broken.

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* Execution model switched to mutation schemata, which enabled parallell execution.

* New terminal UI

* Pytest only, which enabled better integration, cutting execution time significantly.

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* New execution model. This should result in some modest speed improvements when using pytest.

* A special execution mode when using the hammett test runner. This is MUCH MUCH faster. Please try it!

* Dropped support for python < 3.7. If you need to use mutmut on older versions of python, please use mutmut 1.9.0

* Some other speed improvements.