Install and test romtools

trial space: improve flow and some doc details, make `utils` a submodule #332

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Run time

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Job	Run time
test (3.8, openmpi)	1m 36s
test (3.9, openmpi)	1m 38s
test (3.10, mpich)	1m 31s
test (3.10, openmpi)	1m 28s
test (3.11, mpich)	1m 32s
test (3.11, openmpi)	1m 26s
	9m 11s