Cleanup before Fork to 1.0

dune/phasefield/base_parameters.hh

dune/phasefield/base_potentials.hh

dune/phasefield/ff_chns.hh

dune/phasefield/fs_chns_r.hh

dune/phasefield/localoperator/fem_2p_cahnhilliard.hh

dune/phasefield/localoperator/fem_3p_cahnhilliard.hh

dune/phasefield/localoperator/fem_base_chns.hh

dune/phasefield/localoperator/fem_ff_chns_cahnhilliard.hh

dune/phasefield/localoperator/fem_ff_chns_navierstokes.hh

dune/phasefield/localoperator/fem_ffs_chns_r_cahnhilliard.hh

.../phasefield/localoperator/fem_ffs_chns_r_thinplateflow.hh

...sefield/localoperator/fem_fs_chns_driven_thinplateflow.hh

dune/phasefield/localoperator/fem_fs_chns_r_cahnhilliard.hh

dune/phasefield/localoperator/fem_fs_chns_r_instatstokes.hh

dune/phasefield/localoperator/fem_fs_chns_r_thinplateflow.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/fem_base_porenetwork.hh

dune/phasefield/porenetwork/pn_1pflow.hh