ARMI unit tests

Add stub setup.py for editable installations. #69

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Run time

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Job	Run time
build (3.7)	9m 10s
build (3.8)	9m 0s
build (3.9)	8m 36s
build (3.10)	8m 50s
build (3.11)	7m 18s
	42m 54s