[vtkusers] Iterate over disjoint surfaces of an unstructured grid

[Robert Sawko]

After further debug runs with ParaView I found that my test data set has
corrupted edges which sit just below the surface. This is, I think, a
problem of the code which generated the surfaces rather than the filter.
Please see below.

<http://vtk.1045678.n5.nabble.com/file/t342308/artifact.png> 

The surface may be "closed" but the the boundary edge exists and therfore
the test fails. Again, I would appreciate suggestions, but all in all I
think my initial problem is solved.



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