COMP:Removed useless virtual. In addition, as there was no virtual destructor some compilers were complaining.
COMP:Removed useless virtual. In addition, as there was no virtual destructor some compilers were complaining.

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