When comparing values, check for VL=0xFFFFFFFF.
When comparing values, check for VL=0xFFFFFFFF.

This check is for values of type VR and UN, which might use VL=0xFFFFFFFF
for encapsulated data.

dgobbi/vtk-dicom,dgobbi/vtk-dicom,hendradarwin/vtk-dicom,dgobbi/vtk-dicom,hendradarwin/vtk-dicom,hendradarwin/vtk-dicom