STYLE: Remove unused DICOMStudyBrowser/DICOMStudyTable/DICOMSeriesTable
Created by: jcfr
This commit removes part of experimental code added in r19454 (ENH: improvements to DICOM Module) that was illustrating possible implementation during the Slicer DICOM browser meeting of 2012-01-25.
See https://www.assembla.com/spaces/slicerrt/wiki/20120125_Slicer_DICOM_browser_meeting