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Description
Support Python3 (i.e., using iodata, grid, and gbasis) in addition to Python2 (i.e., using horton). So, chemtools can be imported/used with both Python 2 & 3 (some features would not be available with Python 3 yet, which results in an informative error). The tests can also be run with Python 2 & Python 3 (environments with proper dependencies installed) as well; some tests will be skipped depending on the Python version.
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Type of Changes
Please remove the lines that don't represent the type of your PR.
✨ New Feature
🎨 Improve Format & Structure