* misc adaptations/modernizations
plus a few changes to allow pytest discovery
* get the recap unittests running
* pytest config updates
* all tests pass
* integrate the pytest stuff into ctest
* integrate Projects dir
better cmake integration
* ci build env updates
* ignore more files
* remove six.py
* cleanup UnitTestPandasTools
* cleanup pytest
* remove obsolete use of rdkit.six from doctests
* update release notes
* mysterious CI fix
* add conftest to remove some tests
* remove the old python-based testing infrastructure
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Co-authored-by: Ric <ricrogz@gmail.com>
