[vtkusers] Set the visibility of a single cell

[Jana Sefcikova]

Hi , I realized visibility by adding unsigned char array to polydata (0=
not visible, 1=visible) and than thresholding visible points/cells by
vtkThresholdPoints. Here is example

    // Select only used lights

    vtkSmartPointer<vtkThresholdPoints> thresholdF =
vtkSmartPointer<vtkThresholdPoints>::New();

thresholdF->ThresholdBetween(1, 1);

    lightsDirections->GetPointData()->SetActiveScalars("Is_Used");

    thresholdF->SetInputArrayToProcess(0, 0, 0,
vtkDataObject::FIELD_ASSOCIATION_POINTS, "Is_Used");

    //thresholdF->SetInput(lightsDirections);

    thresholdF->SetInputConnection(0,filterGDL->GetOutputPort(1));
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