ENH:Made constructor/destructor protected rather than private
ENH:Made constructor/destructor protected rather than private

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