TODO
changes
GNUmakefile
test/Circular_kernel_2/makefile
examples/Circular_kernel_2/makefile 
bench
Benchmarks/
include/CGAL/Filtered_hexagon_circular_kernel_2.h
include/CGAL/Filtered_hexagon_circular_kernel_2/
Lazy_circular_kernel_2.h
Lazy_circular_kernel_constructions.h
old_lazy/