Pore network model needs dune-foamgrid to work
Add dune-foamgrid to the dune-module list which needs to be installed in the Dumux webpage or mention it separately that to use pore network model you need to install dune-foamgrid.
Add dune-foamgrid to the dune-module list which needs to be installed in the Dumux webpage or mention it separately that to use pore network model you need to install dune-foamgrid.