FOV chain, edge/bottom extraction, attach/broken

What do we have

1. FOV chain not fully tested
2. edge extraction problematic
3. bottom extraction not implemented
4. attach / broken not fully tested

What is the most important

1. FOV chain

How to achieve the most-important goal?

1. CC-edge exit points should be correct -> edge extraction....
2. does edge extraction need correct attach/broken treatment? -> not everywhere