svpost VTK tetrahedra node ordering is wrong

[ktbolt]

The tetrahedra node ordering is different for the solver and VTK. When reading a VTK mesh the nodes are reordered by svpre. However, when the svpost program writes out VTK results files it does not reorder the tetrahedra nodes.

Negative element volumes are then computed in programs like ParaView.

It's not clear how else this may affect other visualization methods like streamlines.