ENH:  Making sure the layout strategy object gets set to NULL in the destructor.
ENH:  Making sure the layout strategy object gets set to NULL in the destructor.

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