New atom selection mechanism #1189

Job	Run time
Build MDANSE and run tests on ubuntu-latest	15m 42s
Build MDANSE and run tests on ubuntu-latest	13m 11s
Build MDANSE and run tests on ubuntu-latest	12m 47s
Build MDANSE and run tests on ubuntu-latest	14m 8s
Build MDANSE and run tests on ubuntu-latest	13m 45s
Build MDANSE and run tests on windows-latest	16m 1s
Build MDANSE and run tests on windows-latest	16m 0s
Build MDANSE and run tests on windows-latest	17m 42s
Build MDANSE and run tests on windows-latest	16m 48s
Build MDANSE and run tests on windows-latest	16m 38s
Build MDANSE and run tests on macOS-latest	11m 2s
Build MDANSE and run tests on macOS-latest	7m 10s
Build MDANSE and run tests on macOS-latest	7m 50s
Build MDANSE and run tests on macOS-latest	8m 53s
Build MDANSE and run tests on macOS-latest	8m 23s
	3h 16m 0s

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