Changed interpolation function from linear to nearest neighbour.
Update to newest version.
Added some lines for testing DVH module. Didn't work, so I commented them for potential later use
Added resampling to Squared Difference - now images can have different sizes.
1. Renamed Squared Difference to Absolute Difference (also in parameter node)
2. Added Interpolation for Aboslute Difference. Images can now have different dimensions.
3. Added ROI for Absolute Difference. You can now specify ROI in Slicer and it will do the calculation only in that region. Will extend this feature also to other CLI modules.