Quick fixes & features to the rtfmri-coloring branch

List of features:
-Cluster level slider now available for Rt-fMRI, which ask the number of minimum connected voxels
-Can now export generated clusters into separate anatomy files
-Fixed anatomy display when using voxel size different than 1x1x1 for rt-fmri
-Can now track RTT from rt-fmri
-Added alpha value to RTT fibers for visualization purposes
-Can now seed rt-fmri from RTT end points
-Fixed zscore formula according to AFNI
-Fixed voxel sizes missing when creating a new anatomy from cuteBoxes options (could not load properly)
-Added Edge detection algo to the anatomies panels. very useful on T1's for overlaying fmri.