overwritten
Others: Add each DOFVector by construction to the list of interchange vectors
and remove them by destruction
If you dont want to exchange the vector, set the boolean synch to false

merge of trunk with arhfile2 branch: 'using namespace' removed from header files, file readers/writer moved to subnamespace AMDiS::io, test for arh2writer added

always accept timestep in Rosenbrock-method if timestep is minimal timestep. There is a warning if tolerance is not reached