[vtkusers] performance issue

[vlibertiaux]

Hello David,

the original image is 820*830*215, the clipped image is about 150*250*50.

The original code (http://codepad.org/DGSZU6XH) indeed used
vtkImplicitFunctionToImageStencil and vtkImplicitDataSet.

For some reason, it is not working anymore with vtk5.6 (the DeepCopy in line
47 is not properly executed), that's why I rewrote it using vtkImageReslice.

This part of the code executed in less than 5s in the original version and
now takes 18s.

V.
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