New atom selection mechanism #1194

Job	Run time
Build MDANSE and run tests on ubuntu-latest	15m 34s
Build MDANSE and run tests on ubuntu-latest	13m 5s
Build MDANSE and run tests on ubuntu-latest	12m 36s
Build MDANSE and run tests on ubuntu-latest	13m 50s
Build MDANSE and run tests on ubuntu-latest	13m 36s
Build MDANSE and run tests on windows-latest	16m 46s
Build MDANSE and run tests on windows-latest	16m 40s
Build MDANSE and run tests on windows-latest	16m 14s
Build MDANSE and run tests on windows-latest	17m 21s
Build MDANSE and run tests on windows-latest	17m 17s
Build MDANSE and run tests on macOS-latest	11m 5s
Build MDANSE and run tests on macOS-latest	8m 4s
Build MDANSE and run tests on macOS-latest	8m 39s
Build MDANSE and run tests on macOS-latest	7m 37s
Build MDANSE and run tests on macOS-latest	8m 12s
	3h 16m 36s

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