removed dependence on OpenGL
removed dependence on OpenGL

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