ENH: Fix threading/debug leaks of vtkCollection.
ENH: Fix threading/debug leaks of vtkCollection.

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