
ENH: Declare some more methods virtual.

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