Release Name: GAMBIT_Executables_1.1

- Add N4 intensity inhomogeneity correction
- Update registration: Demons fluid registration using BRAINSDemonWarp, or B-Spline registration using Brainsfit
- Consider multi-channel images and possibly tissue segmentation label maps
- Perform skull-stripping on all multi-channel images
- Option to skip tissue segmentation step
- Option to skip skull-stripping step
- Improved Quality control MRML scenes with snapshots (sulcal depth and cortical thickness as scalar attributes)
- Bug fixes