Merge branch 'fix/doxygen-inline-comments' into 'next'

dumux/adaptive/initializationindicator.hh

dumux/common/pointsource.hh

dumux/common/properties.hh

dumux/discretization/box/boxgeometryhelper.hh

dumux/discretization/cellcentered/mpfa/helper.hh

...discretization/cellcentered/mpfa/interactionvolumebase.hh

...tization/cellcentered/mpfa/interactionvolumedatahandle.hh

...retization/cellcentered/mpfa/omethod/interactionvolume.hh

dumux/discretization/fluxvariablesbase.hh

...cretization/staggered/freeflow/staggeredgeometryhelper.hh

dumux/discretization/staggered/subcontrolvolumeface.hh

dumux/freeflow/navierstokes/model.hh

dumux/freeflow/navierstokesnc/model.hh

dumux/io/vtkoutputmodule.hh

dumux/linear/amgparallelhelpers.hh

dumux/porousmediumflow/1pnc/model.hh

dumux/porousmediumflow/2p/model.hh

dumux/porousmediumflow/2p1c/model.hh

dumux/porousmediumflow/2p2c/sequential/adaptiveproperties.hh

dumux/porousmediumflow/2p2c/sequential/fvpressure.hh