added new rescaling method ":vinversion" for SurfaceHopping #814

Job	Run time
test (Core)	1m 56s
test (InitialConditions)	1m 44s
test (dynamics_classical)	1m 51s
test (dynamics_mdef)	1m 39s
test (dynamics_surface_hopping)	1m 45s
test (dynamics_cme)	1m 56s
test (dynamics_mapping)	1m 43s
test (dynamics_ehrenfest)	1m 51s
test (dynamics_ensembles)	1m 46s
	16m 11s

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