ENH: Editing laodable names in DICOM widget can now lead to renaming of
the loaded loadables.

Closes #3284

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

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22329 3bd1e089-480b-0410-8dfb-8563597acbee