Changing viewer default options.
Reenabling organ segmentation module.
Merge branch 'refactoring' into develop
Mask rendering, drawing.

Working on th segmentation module.
Dual mask drawing available.
Reenabling TF loading. Filling TF channel curves.
Fixes for release version in VS 2013.
Multiple iso surface spaecification widgets. Secondary dataset rendering. ITK integration.
Refactoring image statistics computation.
Merge remote-tracking branch 'remotes/origin/develop' into pavel