Avoid making DFS assumptions

[michielbdejong]

The current way of going straight from probe to scout assumes that all other nodes are doing depth-first-search, and so only O-loops and P-loops occur.
It would be better to bring the Trace messages from Saiga back in so that if a Jerboa lives in a network where some of the other nodes to breadth-first-search, it can still safely cooperate to find the loop, even if it's a kite loop.