Merge branch 'cherry-pick-ee9f4093' into 'releases/3.8'

dumux/porousmediumflow/1p/model.hh

dumux/porousmediumflow/1pnc/model.hh

dumux/porousmediumflow/1pncmin/model.hh

dumux/porousmediumflow/2p/model.hh

dumux/porousmediumflow/2p1c/model.hh

dumux/porousmediumflow/2p2c/model.hh

dumux/porousmediumflow/2pnc/model.hh

dumux/porousmediumflow/2pncmin/model.hh

dumux/porousmediumflow/3p/model.hh

dumux/porousmediumflow/3p3c/model.hh

dumux/porousmediumflow/3pwateroil/model.hh

dumux/porousmediumflow/mpnc/model.hh

dumux/porousmediumflow/nonisothermal/model.hh

dumux/porousmediumflow/richards/model.hh

dumux/porousmediumflow/richardsextended/model.hh

dumux/porousmediumflow/richardsnc/model.hh

dumux/porousmediumflow/solidenergy/model.hh

dumux/porousmediumflow/tracer/model.hh