Fixing a few bugs and adding functionality

Changed:
1. viewGet(vw,'Anat') to handle different viewTypes
2. niftiGet(nii,'N Slices') to automatically default to using slice dim if slice_end and slice_start don't exist - more lenient handling of the data.
3. Changed session migration to use the same check as openMontageWindow so it will update if it is necessary.
4. Added loadAnat to the initHiddenInplane view.