ENH: Fixed issues 3579, 3798 and other dicom browser improvements

Improvements:

• Added the table density control to the slicer dicom browser for
  controlling table densities in three levels: comact, cozy and
  comfortable. The default value would be compact. Changing the settings
  would be saved in slicer user settings.
• Re-arranged the patient, study and series search boxex so that the
  search box will be on the top of tables for both horizontal and vertical
  cases (This will add more space to dicom tables)
  tables)
• The bug with browser size change on advanced view is fixed (issue 0003798)
• The feature to resize tables based on contents was added to the tables.

From: Alireza Mehrtash <mehrtash@bwh.harvard.edu>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23628 3bd1e089-480b-0410-8dfb-8563597acbee