[bug] Inconsistencies in a double linked list

[vvoovv]

facade_visibility/berlin_karl_marx_allee.osm

street.id == 574
section.id == 115
section.succ.id == 229
section.succ.pred.id == 126
But it must be section.succ.pred.id == 115 !

[polarkernel]

But it must be section.succ.pred.id == 115 !

Fixed by last commit. The object section.succ is a minor Intersection. Intersections normally don't have a pred and a succ reference, because intersections may have multiple exits. This is already the second very hidden issue with minor intersections. The issue is patched for now, but I consider creating two different classes Intersection and MinorIntersection for more clarity.

[vvoovv]

Let's keep this issue until a proper data structure for minor Intersections is introduced