Simplify Chemical System #1074

Job	Run time
Build MDANSE and run tests on ubuntu-latest	6h 0m 13s
Build MDANSE and run tests on ubuntu-latest	13m 45s
Build MDANSE and run tests on ubuntu-latest	11m 31s
Build MDANSE and run tests on ubuntu-latest	11m 31s
Build MDANSE and run tests on ubuntu-latest	10m 40s
Build MDANSE and run tests on ubuntu-latest	10m 40s
Build MDANSE and run tests on ubuntu-latest	11m 54s
Build MDANSE and run tests on ubuntu-latest	11m 54s
Build MDANSE and run tests on windows-latest	18m 19s
Build MDANSE and run tests on windows-latest	18m 19s
Build MDANSE and run tests on windows-latest	18m 30s
Build MDANSE and run tests on windows-latest	18m 30s
Build MDANSE and run tests on windows-latest	16m 55s
Build MDANSE and run tests on windows-latest	16m 55s
Build MDANSE and run tests on windows-latest	18m 29s
Build MDANSE and run tests on windows-latest	18m 29s
Build MDANSE and run tests on macOS-latest	14m 30s
Build MDANSE and run tests on macOS-latest	14m 30s
Build MDANSE and run tests on macOS-latest	6m 52s
Build MDANSE and run tests on macOS-latest	6m 52s
Build MDANSE and run tests on macOS-latest	8m 26s
Build MDANSE and run tests on macOS-latest	8m 26s
Build MDANSE and run tests on macOS-latest	8m 20s
Build MDANSE and run tests on macOS-latest	8m 20s
	11h 2m 50s

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