Documentation of MultipleCodimMultipleGeomTypeMapper is incomplete
Since f4f1a595 the MultipleCodimMultipleGeomTypeMapper
supports multiple DOFs per entity. The documentation of this feature is rather incomplete. E.g. the class documentation of the mapper and the layout class do not mention it and the documentation of the indices
method is hard to understand (and in fact incorrect) if you do not already know what it does.