ENH: Update to DCMTK-3.6.1_20161102

Suggested-by: Andriy Fedorov <fedorov@bwh.harvard.edu>
Tested-by: Christian Herz <christianherz1985@gmail.com>

$ git shortlog efe1a17..DCMTK-3.6.1_20161102 --no-merges
Jan Schlamelcher (11):
Fixed wrong usage of checkStringValue() in dcmpmap.
Several fixes for dcmpstat.
Fixed 32 vs. 64 bit problem in dcmqrdb.
Fixed using third party libraries with MinGW.
Fixed a problem with a previous commit.
Added OFvariant implementation for C++11.
Added API documentation for OFvariant etc.
Updated Makefile dependencies.
Updated man pages for new development snapshot.
Updated DCMTK_ABI_VERSION for new development snapshot.
Updated CHANGES.361 for new development snapshot.

Joerg Riesmeier (3):
Made clear that options +/-Uo require +Ug.
Output debug messages when updating attributes.
Added readXML mode that accepts empty/missing UID.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@25499 3bd1e089-480b-0410-8dfb-8563597acbee