Only process the DICOMDIR file under specific conditions.
Only process the DICOMDIR file under specific conditions.

The DICOMDIR file is only used if it is at the base level within
the directory set with SetDirectoryName().  All other DICOMDIR files
are ignored.

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