Replace ModelP by HAVE_MPI
In Dune module HAVE_MPI
indicates the parallel case. dune-uggrid uses ModelP
. We should drop the latter and use the variable of the other Dune modules.
In Dune module HAVE_MPI
indicates the parallel case. dune-uggrid uses ModelP
. We should drop the latter and use the variable of the other Dune modules.