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added cubed sphere meshes and a test
Reordering at least gets cube right on level 0.

Catch Cell("quadrilateral",3) inside io.py
Check for cellname()="quadrilateral" instead of Cell("quadrilateral")
in _ufl_finite_element and _ufl_vector_element
Restored original ordering, it was correct but we weren't catching
the quadrilateral, same problem again.
Making a handtooled cube mesh generator.
This causes a segfault upon calling mesh.Mesh(plex, dim=3,reorder=reorder) as well.
make a separate _cubed_vertices_and_faces() function for debugging
Fixed a few bugs in the numbering.
need to equispace points on cube edges along geodesic.
did some lint-ing
Add a cubed sphere test.