Merge pull request #2405 from SciML/firk_order #3969

Job	Run time
test (InterfaceI, 1)	16m 20s
test (InterfaceII, 1)	22m 18s
test (InterfaceIII, 1)	11m 37s
test (Integrators_I, 1)	17m 8s
test (AlgConvergence_I, 1)	6m 59s
test (AlgConvergence_II, 1)	5m 44s
test (AlgConvergence_III, 1)	8m 22s
test (Downstream, 1)	17m 2s
test (ODEInterfaceRegression, 1)	7m 30s
test (Multithreading, 1)	10m 31s
test (OrdinaryDiffEqAdamsBashforthMoulton, 1)	7m 14s
test (OrdinaryDiffEqBDF, 1)	9m 39s
test (OrdinaryDiffEqCore, 1)	5m 56s
test (OrdinaryDiffEqDefault, 1)	6m 9s
test (OrdinaryDiffEqDifferentiation, 1)	6m 11s
test (OrdinaryDiffEqExplicitRK, 1)	5m 55s
test (OrdinaryDiffEqExponentialRK, 1)	8m 56s
test (OrdinaryDiffEqExtrapolation, 1)	8m 29s
test (OrdinaryDiffEqFIRK, 1)	8m 9s
test (OrdinaryDiffEqFeagin, 1)	7m 51s
test (OrdinaryDiffEqFunctionMap, 1)	5m 54s
test (OrdinaryDiffEqHighOrderRK, 1)	7m 14s
test (OrdinaryDiffEqIMEXMultistep, 1)	5m 56s
test (OrdinaryDiffEqLinear, 1)	7m 48s
test (OrdinaryDiffEqLowOrderRK, 1)	8m 4s
test (OrdinaryDiffEqLowStorageRK, 1)	13m 27s
test (OrdinaryDiffEqNordsieck, 1)	7m 7s
test (OrdinaryDiffEqPDIRK, 1)	5m 45s
test (OrdinaryDiffEqPRK, 1)	5m 56s
test (OrdinaryDiffEqQPRK, 1)	6m 51s
test (OrdinaryDiffEqRKN, 1)	8m 38s
test (OrdinaryDiffEqRosenbrock, 1)	12m 43s
test (OrdinaryDiffEqSDIRK, 1)	5m 58s
test (OrdinaryDiffEqSSPRK, 1)	9m 10s
test (OrdinaryDiffEqStabilizedIRK, 1)	6m 30s
test (OrdinaryDiffEqStabilizedRK, 1)	8m 7s
test (OrdinaryDiffEqSymplecticRK, 1)	14m 17s
test (OrdinaryDiffEqTsit5, 1)	5m 59s
test (OrdinaryDiffEqVerner, 1)	6m 3s
	5h 49m 27s

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