702d7d4 install code linters (flake8, mypy)

Authored and Committed by kparal 2 years ago
    install code linters (flake8, mypy)
    
    Add new requirements-development.txt, which installs code linters. These linters
    often have editor/IDE integration, or can be run manually. Update
    development.rst to include some guidance.
    
    Create setup.cfg to have a centralized tool configuration. Move pytest.ini
    content into setup.cfg. (Also add a few more deprecation warning filters for
    our libraries).
    
        
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