84dad2249e
* Change: In Anabatic:
- Long wires, going straight accross multiple GCells were splitted
into a long sequence of segment+contact, one for each gone-through
GCell. It was memory-consuming and algorithmically inefficient.
Now there is only one straight wire.
As a consequence, Edges now store the list of all segments
going through them. That way we do not need to load a Net into
Dijkstra before riping up some of it's segment. The ripup mechanims
can now be implemented right at AnabaticEngine level, without
dependencies over Dijkstra. Note that long wires are automatically
broken in two if we need to attach a new branch on it (breakAt()).
And fused back into one if a branch is removed (unify()).
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