drop support for vertex normals, provide PolyDataNormals with PolyDataObject
add processedDataSet to DataObject interface
adjust QVtkTableModelPolyData for new PolyDataObject interface, data updates now handled by the VTK pipeline
update AttributeArrayComponentMapping and poly data rendering to allow normal component mapping
ScalarsForColorMapping::createFilter now sets filter inputs
provide filtered centroids for color mapping (VertexComponentMapping)

same features as old CoordinateValueMapping, but without unneeded calculations and better integrated into the pipeline
apply d-pointer pattern to DataObject

see http://qt-project.org/wiki/Dpointer
provide DataObject ptr as information in mappers
use PolyDataObject's cellCenters instead of centroid array in InteractorStyle3D
remove special "centroid" input vector