Make DeformVolume module

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By using a vtkGridTransform and the vtkImageReslice, you can make a module
to deform a volume given a deformation / displacement field.

This will get interesting combining the conventions of deformable
registration (vectors point from moving into fixed volume), vtkImageReslice
(transforming the volume is the same as transforming the domain with the
inverse, which is what imagereslice expects) and the vtkGridTransform (no
idea).

Original issue reported on code.google.com by cpbotha on 22 Jul 2009 at 10:07