The spatial parameter classes are located under material/spatialparams. I think this historically may have made sense when only porous media were considered. However, the spatial parameters are more general that. With parameters like
extrusionFactor (see #1001) that are not necessarily connected to some material, we interpret the spatial parameters really just as (potentially) spatially varying parameter fields.
What would be a better place?
common/spatialparams? Or just move the headers to the respective subfolders, i.e. porousmediumflow spatial params to
porousmediumflow and porenetwork spatial params to
porenetwork and so on?