- this submodule (https://develop.openfoam.com/modules/visualization)
  consolidates VTK-related visualization routines:

    * catalyst
    * paraview-plugins
    * runTimePostProcessing

  A benefit of this is make it easier to mix and match
  different combinations of VTK/ParaView versions and capabilities
  (Eg, MESA, MPI etc).

The catalyst submodule is now obsolete