Tests

Fix `solve_charge_by_mag()` using wrong key in `structure.site_proper… #454

Job	Run time
tests (ubuntu-latest)	6m 32s
tests (macos-latest)	11m 37s
tests (windows-latest)	17m 26s
Build wheels for Python ${{ matrix.python-version }} on ${{ matrix.os }}	0s
Build source distribution	0s
Release wheels and source distribution to PyPI	0s
	35m 35s

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