Fixed C++ tet4 feassemble stuff for outward order.

Matt flipped the internal PyLith ordering of vertices for tet4 cells to
outward pointing. In the feassemble tests, we build the mesh, so the
automatic inverting in meshio didn't happen. The tests previously passed
because the feassemble geometry stuff hadn't been updated to reflect the
new ordering.
Add missing timedb file for examples/bar_shearwave/quad4.