ENH: dicom header viewer added to DICOMLib using ctkDICOMObjectListWidget

ENH: update DICOM module for Table View

New interface to support better searching and header display.

Now plugins are selectable to avoid wasting time on unneeded plugins.

Plugins are now evaluated on-demand, to simplify the workflow.

http://www.commontk.org/index.php/CTK-Hackfest-May-2013#DICOM_Database_and_Networking

https://github.com/commontk/CTK/pull/361

ENH: update to latest CTK for header widget

Also fix lingering rebase issue (stray variable).

BUG: Give header popup independent geometry setting

Also fix incorrect end of line character

ENH: examine button diabled until needed

STYLE: remove tabs in code

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22689 3bd1e089-480b-0410-8dfb-8563597acbee