Pytest-incremental

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- drop python 3.5
- add python 3.8, 3.9
- support pytest 6.x

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- drop python 2 support
- require doit==0.31, pytest==4.0

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- fix tox. include dependencies

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- include tests and docs on distribution package

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- move development to github
- major re-rewrite, renamed all command line options
- support for python 3
- re-ordering of test execution

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- fixes to work with latest doit (0.20)