COMP: Update libminc from upstream, fixing a compiler warning on OSX

Change-Id: I0671c5d2d68075099418d3becb9274dc3dfdd47c
STYLE: Removed itkExtras folder

I think this folder is some leftover. There was more stuff before in this folder but it has been stripped down to the remaining unique __init__.py file. It's not good practice to have a lot of python code in the __init__.py files (especially classes and functions ...).

I propose we remove the folder if it's not used. The code in __init__.py was moved to a new itkExtras.py file and I removed the last lines because those were only there to import all the modules in the itkExtras folder.
Merge topic 'MINC-Enum-Warning'

eed2370a COMP: Update libminc from upstream, fixing a compiler warning on OSX
COMP: Fix downcast warnings

This fixes warnings, typically where a double is implicitly converted to
an int.

Change-Id: Ib994dfdf1152f43a222746dec5b7fee39c23d33a
Merge topic 'cleanup-itkExtras'

ae7aa0f6 STYLE: Removed itkExtras folder
Merge topic 'GCC4.1-Dashboard-Warnings'

3106eb2d COMP: Fix downcast warnings