Merge pull request #2021 from meson800/apply_callback_type_stability #2112

Job	Run time
test (InterfaceI, 1)	20m 16s
test (InterfaceI, 1.6)	31m 11s
test (InterfaceII, 1)	26m 49s
test (InterfaceII, 1.6)	37m 5s
test (InterfaceIII, 1)	16m 37s
test (InterfaceIII, 1.6)	23m 8s
test (Integrators_I, 1)	18m 8s
test (Integrators_I, 1.6)	29m 28s
test (AlgConvergence_I, 1)	27m 50s
test (AlgConvergence_I, 1.6)	28m 11s
test (AlgConvergence_II, 1)	30m 2s
test (AlgConvergence_II, 1.6)	29m 33s
test (AlgConvergence_III, 1)	26m 18s
test (AlgConvergence_III, 1.6)	44m 37s
test (Downstream, 1)	19m 2s
test (Downstream, 1.6)	19m 4s
test (ODEInterfaceRegression, 1)	19m 58s
test (ODEInterfaceRegression, 1.6)	18m 22s
test (Multithreading, 1)	13m 35s
test (Multithreading, 1.6)	19m 31s
	8h 18m 45s

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