Timo Koch authored Oct 29, 2020 and Kilian Weishaupt committed Oct 30, 2020

When using the old interface we hard code the MPAdapater like before in
the volvars. When using new-sytle fluidmatrixinteractions we require
the spatial params to return a MP-sytle material law. This can be
acheived by simply wrapping a twop law using MPAdapter.