Extend vtkPolygonBuilder to return multiple disjoint polygons, if present.
This fix is in reference to bug report 0015582. In cases where a single cell is cut into multiple cells, it is necessary to return disjoint polygon elements in vtkPolygonBuilder. Additionally, a test provided by Andreas Buykx has been included that tests the ability of vtkPolygonBuilder to construct multiple disjoint polygons.
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