Merge branch 'feature/less-typetag-in-vtkoutputfields' into 'master'

dumux/discretization/staggered/freeflow/facevariables.hh

dumux/freeflow/navierstokes/model.hh

dumux/freeflow/navierstokes/vtkoutputfields.hh

dumux/freeflow/navierstokesnc/model.hh

dumux/freeflow/navierstokesnc/vtkoutputfields.hh

dumux/freeflow/nonisothermal/model.hh

dumux/freeflow/nonisothermal/vtkoutputfields.hh

dumux/io/staggeredvtkoutputmodule.hh

dumux/io/vtkoutputmodule.hh

dumux/porousmediumflow/1p/model.hh

dumux/porousmediumflow/1p/vtkoutputfields.hh

dumux/porousmediumflow/1pnc/model.hh

dumux/porousmediumflow/1pnc/vtkoutputfields.hh

dumux/porousmediumflow/1pncmin/model.hh

dumux/porousmediumflow/2p2c/model.hh

dumux/porousmediumflow/2p2c/vtkoutputfields.hh

dumux/porousmediumflow/2pnc/model.hh

dumux/porousmediumflow/2pnc/vtkoutputfields.hh

dumux/porousmediumflow/2pncmin/model.hh

dumux/porousmediumflow/3p/model.hh