Merge pull request #2034 from tshort/return-nothing #2132

Job	Run time
test (InterfaceI, 1)	24m 27s
test (InterfaceI, 1.6)	28m 28s
test (InterfaceII, 1)	27m 19s
test (InterfaceII, 1.6)	32m 21s
test (InterfaceIII, 1)	15m 42s
test (InterfaceIII, 1.6)	22m 53s
test (Integrators_I, 1)	19m 24s
test (Integrators_I, 1.6)	21m 28s
test (AlgConvergence_I, 1)	23m 34s
test (AlgConvergence_I, 1.6)	37m 14s
test (AlgConvergence_II, 1)	31m 59s
test (AlgConvergence_II, 1.6)	30m 3s
test (AlgConvergence_III, 1)	26m 31s
test (AlgConvergence_III, 1.6)	40m 19s
test (Downstream, 1)	20m 12s
test (Downstream, 1.6)	24m 13s
test (ODEInterfaceRegression, 1)	17m 45s
test (ODEInterfaceRegression, 1.6)	19m 24s
test (Multithreading, 1)	18m 21s
test (Multithreading, 1.6)	14m 44s
	8h 16m 21s

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