-----------------------------------------
domain                 referenceElement     Entity/Geometry
position               toGlobal             Geometry
localPosition          toLocal              Geometry

Also added referenceElement to Intersection class

call back to python taking advantage of vectorization

Changes include
- export dimension
- add methods returning information for all subentities of a codimension
- add variants taking `std::tuple< int, int >` instead of two integers to
  describe a subentity
- add checks for input parameters
- add some documentation