added Compound blending mode (example, regression test)
added Compound blending mode (example, regression test)

arnaudgelas/VTK,msmolens/VTK,johnkit/vtk-dev,mspark93/VTK,sankhesh/VTK,gram526/VTK,berendkleinhaneveld/VTK,daviddoria/PointGraphsPhase1,Wuteyan/VTK,sankhesh/VTK,keithroe/vtkoptix,candy7393/VTK,hendradarwin/VTK,spthaolt/VTK,keithroe/vtkoptix,berendkleinhaneveld/VTK,ashray/VTK-EVM,sumedhasingla/VTK,cjh1/VTK,gram526/VTK,jmerkow/VTK,mspark93/VTK,SimVascular/VTK,sankhesh/VTK,keithroe/vtkoptix,daviddoria/PointGraphsPhase1,Wuteyan/VTK,mspark93/VTK,berendkleinhaneveld/VTK,aashish24/VTK-old,mspark93/VTK,demarle/VTK,msmolens/VTK,candy7393/VTK,mspark93/VTK,candy7393/VTK,jeffbaumes/jeffbaumes-vtk,naucoin/VTKSlicerWidgets,keithroe/vtkoptix,aashish24/VTK-old,biddisco/VTK,aashish24/VTK-old,arnaudgelas/VTK,mspark93/VTK,jeffbaumes/jeffbaumes-vtk,johnkit/vtk-dev,hendradarwin/VTK,spthaolt/VTK,cjh1/VTK,demarle/VTK,sankhesh/VTK,SimVascular/VTK,collects/VTK,sumedhasingla/VTK,msmolens/VTK,keithroe/vtkoptix,hendradarwin/VTK,collects/VTK,Wuteyan/VTK,gram526/VTK,SimVascular/VTK,ashray/VTK-EVM,gram526/VTK,johnkit/vtk-dev,aashish24/VTK-old,johnkit/vtk-dev,keithroe/vtkoptix,sankhesh/VTK,jeffbaumes/jeffbaumes-vtk,SimVascular/VTK,keithroe/vtkoptix,demarle/VTK,daviddoria/PointGraphsPhase1,spthaolt/VTK,hendradarwin/VTK,sumedhasingla/VTK,spthaolt/VTK,daviddoria/PointGraphsPhase1,sumedhasingla/VTK,candy7393/VTK,msmolens/VTK,arnaudgelas/VTK,naucoin/VTKSlicerWidgets,biddisco/VTK,jmerkow/VTK,SimVascular/VTK,gram526/VTK,gram526/VTK,collects/VTK,hendradarwin/VTK,spthaolt/VTK,spthaolt/VTK,johnkit/vtk-dev,biddisco/VTK,collects/VTK,jmerkow/VTK,spthaolt/VTK,jmerkow/VTK,arnaudgelas/VTK,naucoin/VTKSlicerWidgets,ashray/VTK-EVM,naucoin/VTKSlicerWidgets,demarle/VTK,collects/VTK,cjh1/VTK,biddisco/VTK,biddisco/VTK,cjh1/VTK,jmerkow/VTK,sumedhasingla/VTK,naucoin/VTKSlicerWidgets,daviddoria/PointGraphsPhase1,arnaudgelas/VTK,SimVascular/VTK,johnkit/vtk-dev,demarle/VTK,berendkleinhaneveld/VTK,Wuteyan/VTK,gram526/VTK,SimVascular/VTK,biddisco/VTK,Wuteyan/VTK,berendkleinhaneveld/VTK,sgh/vtk,msmolens/VTK,sankhesh/VTK,mspark93/VTK,Wuteyan/VTK,hendradarwin/VTK,cjh1/VTK,sumedhasingla/VTK,sgh/vtk,gram526/VTK,johnkit/vtk-dev,msmolens/VTK,sgh/vtk,daviddoria/PointGraphsPhase1,candy7393/VTK,ashray/VTK-EVM,cjh1/VTK,SimVascular/VTK,jeffbaumes/jeffbaumes-vtk,demarle/VTK,hendradarwin/VTK,biddisco/VTK,jeffbaumes/jeffbaumes-vtk,sgh/vtk,sgh/vtk,Wuteyan/VTK,sankhesh/VTK,msmolens/VTK,aashish24/VTK-old,msmolens/VTK,jmerkow/VTK,jeffbaumes/jeffbaumes-vtk,candy7393/VTK,berendkleinhaneveld/VTK,ashray/VTK-EVM,sgh/vtk,ashray/VTK-EVM,ashray/VTK-EVM,demarle/VTK,demarle/VTK,berendkleinhaneveld/VTK,collects/VTK,jmerkow/VTK,sumedhasingla/VTK,aashish24/VTK-old,candy7393/VTK,jmerkow/VTK,candy7393/VTK,naucoin/VTKSlicerWidgets,sumedhasingla/VTK,mspark93/VTK,ashray/VTK-EVM,sankhesh/VTK,arnaudgelas/VTK,keithroe/vtkoptix