deprecate and remove the OctreeFractal

As memory serves, this class was a precursor to vtkHyperTreeGrid. It is no longer being developed, crashes easily, and obfuscates the user interface. We should check and see if anyone is actively using it, and if not deprecate and remove it from VTK and ParaView.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information