BUG: 3688 unicode characters from dicom

Add a utility to handle unicode conversion.  It works in the
ScalarVolume plugin but not in the Subject Hiearchy
code.  I want to run this by @pinter for help.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23472 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: unicodeify date to fix subject hierarchy

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23473 3bd1e089-480b-0410-8dfb-8563597acbee