Added hemi option xh and option --cw

xh is for cross-hemisphere connectivity analysis.

--cw is for the use of Corpus Callosum as a waypoint, mainly for the between-hemisphere analysis.
Added support for xh
	modified:   get_aparc12_cortical_rois.m
Making standalone
Adding support for --cw

--cw is for the use of Corpus Callosum as a waypoint, mainly for cross-hemisphere tracking.