[x] remove MappingMortar and MortarFacetBasis; rename skfem.experimental.supermeshing to skfem.supermeshing; do the related changes to examples and tests
[x] consider deprecating InteriorFacetBasis(..., side=0) because it would add little to no value over FacetBasis(..., facets=mesh.interior_facets(), side=0) (this would require adding Mesh.interior_facets())
[x] deprecate skfem.visuals.glvis; this seems to not work anymore
[ ] consider removing the deprecated skfem.utils.projection, skfem.utils.project
[ ] consider removing the deprecated FacetBasis.trace()
Before 9.0.0
MappingMortarandMortarFacetBasis; renameskfem.experimental.supermeshingtoskfem.supermeshing; do the related changes to examples and testsInteriorFacetBasis(..., side=0)because it would add little to no value overFacetBasis(..., facets=mesh.interior_facets(), side=0)(this would require addingMesh.interior_facets())skfem.visuals.glvis; this seems to not work anymoreskfem.utils.projection,skfem.utils.projectFacetBasis.trace()