Merge branch 'cleanup/box-facet-dof-enrichment' into 'master'

CHANGELOG.md

dumux/multidomain/facet/vertexmapper.hh

test/multidomain/facet/1p_1p/CMakeLists.txt

...multidomain/facet/1p_1p/box_dof_enrichment/CMakeLists.txt

...acet/1p_1p/box_dof_enrichment/grids/extended_fracture.msh

...idomain/facet/1p_1p/box_dof_enrichment/grids/geometry.geo

...n/facet/1p_1p/box_dof_enrichment/grids/short_fracture.msh

test/multidomain/facet/1p_1p/box_dof_enrichment/main.cc

test/multidomain/facet/1p_1p/box_dof_enrichment/params.input

...ultidomain/facet/1p_1p/box_dof_enrichment/problem_bulk.hh

...tidomain/facet/1p_1p/box_dof_enrichment/problem_lowdim.hh

.../multidomain/facet/1p_1p/box_dof_enrichment/properties.hh

...ltidomain/facet/1p_1p/box_dof_enrichment/spatialparams.hh

..._1p1p_dof_enrichment_extended_fracture_bulk-reference.vtu

...p1p_dof_enrichment_extended_fracture_lowdim-reference.vtp

...t_1p1p_dof_enrichment_short_fracture_lowdim-reference.vtp