Convert Tetrahedron tests to use Manifold
Convert Tetrahedron tests to use Manifold

Note to self: I may have changed definitions of (1,3) and (3,1)! The Tetrahedron tests called a (1,3) cell a simplex with 1 timevalue on the lower and 3 upper; whereas now a (1,3) has 1 higher timevalue and 3 lower timevalues.
acgetchell/CDT-plusplus,acgetchell/CDT-plusplus,acgetchell/CDT-plusplus