[VTK-4347] Use propertiesLastModified as lastModified for collections
[VTK-4347] Use propertiesLastModified as lastModified for collections

vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk