Fix vtkDICOMDirectory problem with repeated files
Fix vtkDICOMDirectory problem with repeated files

The "break" for the inner loop did not have the desired result,
a "continue" for the output loop is also required in order to
ignore file that have already been enountered via a different path.

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