ENH: add an example for vtkImageTracerWidget
ENH: add an example for vtkImageTracerWidget

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