modif in rays.py
Merge branch 'master' of https://github.com/buguen/pylayers
commiting before pull
Merge branch 'master' of https://github.com/pylayers/pylayers
fixing bug in del_points
fixing bug in delete subsegment
updating
fixing conflict
loc
fixing bug in slab.py
Merge branch 'master' of https://github.com/buguen/pylayers