[vtkusers] Iterate over disjoint surfaces of an unstructured grid

[Robert Sawko]

After some more googling, cross-checking in PV I think I can achieve what I
want by using vtkConnectivityFilter and perhaps combining it with threshold
filter. It doesn't look elegant but it gets me where I want as I want to
simply extract each connected region. Then I can combine it with this
example:

https://cmake.org/Wiki/VTK/Examples/Cxx/PolyData/ClosedSurface

I still don't know how to do my conversion from XMLUnstructuredGridReader,
but I am looking into it... 



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