[vtkusers] updating imagedata spacing

[Richard Layman]

I have a vtkExtractVOI object in my code and its VOI is updated on user 
interaction, at which time I also change the spacing of the output image 
data as follows:

extractvoi.SetVOI(new_voi)
extractvoi.GetOutput().SetUpdateExtent(new_voi)
extractvoi.Update()
extractvoi.GetOutput().SetSpacing(new_spacing)

It works under 4.2 but it fails to update the spacing with VTK5.0. How 
should this be modified to work with 5.0? Thanks.

Richard

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