Add vtkImageOcclusionSpectrum to CMakeLists
Add vtkImageOcclusionSpectrum to CMakeLists

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