rev-0_1_0	(version 0.1: first release) DiscreteDivergenceSkeleton 
		is implemented now.

rev-0_0_2	(version 0.0.2) added README in lib/

rev-0_0_1	(version 0.0.1) first tagged revision
		before the packaged version. Has no curve splitting
		and the DiscreteDivergenceSkeleton is not complete.