ENH: Minor NURBS3DVolume refactoring

- controlPointsDefinition is now controled by a class with
  runTimeSelection.
- Added a new controlPointsDefinition option that translates, rotates
  and scales a given box. The required entries have the same meaning as
  in the Paraview 'Transform' filter, facilitating the transition between the
  visual placement of control boxes (e.g. in Paraview) and their setup
  in the code.
- Improved performance during the parameterization, sensitivity
  computation and grid displacement phases by re-using already computed
  basis functions.