Use parser-based query in vtkDICOMDirectory.
Use parser-based query in vtkDICOMDirectory.

In vtkDICOMDirectory, the parser is used as a scanner that only reads
data elements that are of interest.  This improves the efficiency.

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