Add depth peeling benchmark.
This 10M triangle scene stresses depth peeling implementations to see how well they perform. Results (nVidia Quadro 2000M, Release build): vtkDepthPeelingPass: 1.2 FPS (0.77s first frame, 0.83s subsequent) vtkDualDepthPeelingPass: 2.5 FPS (0.56s first frame, 0.40s subsequent) We see a roughly 50% improvement with the new dual algorithm, since the dual algorithm peels 2 layers per geometry pass. For reference, simple alpha blending results in 49 FPS, 0.18s first frame, 0.020s subsequent.
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