Create local dof to global dof value

For non-oriented meshes and some dofs that involve normal or tangent vectors, one need to define an operator that considers the orientation of the local normal wrt to the face normal. E.g., the face normal can be the outward normal of the first of the two cells, and the cell normals outward normals. Thus, in the second cell, the local dof values must be "multiplied by" -1 before assembly. It has to be done. Probably, we could just consider the machinery of constrained FE spaces to be developed and consider a constrained FE space when dealing with e.g. Raviart-Thomas on non-oriented hex meshes. For tets, not a problem, since we always orient meshes.