fixed help
Changed the lighting so that if multiple fiber groups are displayed in the
same window they will both by properly lit.  Also adding a new fiber group
to the plotting window no longer changes the axis scaling
'New function to add a slice from a nifti image to a 3D plot.  This function
can be used with AFQ_RenderFibers.
Fixed placement of images with negative coordinates
New functions for segmenting and displaying fiber groups
added argument checking
fixed colors
fixed roi name
Now there is a check to make sure that there are more fibers in the fiber group than the number that the user chooses to render
Now we clean the ROIs after reverse normalizing
posterior arcuate must pass through voxels with superior inferior orientatoin
posterior arcuate must pass through voxels with superior inferior orientatoin
posterior segment of the arcuate must not head anterior of the central sulcus
Render an roi as a 3D mesh
ROIs are now read from nifti files rather than mat files
ROIs were converted into nifti files
Load nifti rois rather than mat
added function to convert a set of coordinates to a binary image
changed defualt color of the fiber group to blue
Changed ROI bounding box