Synchronize vtkMatrix3x3 with vtkMatrix4x4.
The vtkMatrix3x3 code is a copy-paste of the vtkMatrix4x4 code, and a lot of what was copied from vtkMatrix4x4 was cruft. Now that vtkMatrix4x4 has been cleaned up, the same is needed for vtkMatrix3x3.
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The vtkMatrix3x3 code is a copy-paste of the vtkMatrix4x4 code, and a lot of what was copied from vtkMatrix4x4 was cruft. Now that vtkMatrix4x4 has been cleaned up, the same is needed for vtkMatrix3x3.