Porenetwork 1p first mockup finished

dune/phasefield/base_parameters.hh

dune/phasefield/boundary_rectangular.hh

dune/phasefield/ffs_chns_r.hh

dune/phasefield/initial_fn.hh

dune/phasefield/porenetwork/1p_chns.hh

dune/phasefield/porenetwork/fem_1p_cahnhilliard_r.hh

dune/phasefield/porenetwork/fem_1p_navierstokes.hh

dune/phasefield/porenetwork/pn_1pflow.hh

dune/phasefield/porenetwork/pn_initial.hh

src/paper_thinstrip_full/thinstrip_boundary.hh

src/pntest/pn1p.ini

src/pntest/pntest.cc

src/summerschool/2p_driver.hh

src/summerschool/ss_calcite.ini