Merge pull request #2048 from pepijndevos/pv/linear #2262

Job	Run time
test (InterfaceI, 1.9)	16m 4s
test (InterfaceI, 1)	15m 35s
test (InterfaceII, 1.9)	20m 33s
test (InterfaceII, 1)	20m 35s
test (InterfaceIII, 1.9)	12m 24s
test (InterfaceIII, 1)	12m 27s
test (Integrators_I, 1.9)	16m 42s
test (Integrators_I, 1)	16m 3s
test (AlgConvergence_I, 1.9)	18m 25s
test (AlgConvergence_I, 1)	19m 16s
test (AlgConvergence_II, 1.9)	20m 7s
test (AlgConvergence_II, 1)	19m 50s
test (AlgConvergence_III, 1.9)	21m 18s
test (AlgConvergence_III, 1)	22m 12s
test (Downstream, 1.9)	6m 50s
test (Downstream, 1)	6m 57s
test (ODEInterfaceRegression, 1.9)	6m 57s
test (ODEInterfaceRegression, 1)	6m 53s
test (Multithreading, 1.9)	12m 3s
test (Multithreading, 1)	12m 2s
	5h 3m 13s

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