1) edited exp_map so that it takes the norm as an argument. This helps
generalizing it for other objects in the unit sphere.
2) added l2_curvenorm, which is the norm function for open curves in a
sphere
3) modified calculatecentroid to expose the length if it is asked
1) edited exp_map so that it takes the norm as an argument. This helps generalizing it for other objects in the unit sphere. 2) added l2_curvenorm, which is the norm function for open curves in a sphere 3) modified calculatecentroid to expose the length if it is asked