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Thanks to Amir Livne Bar-on for contributing this. It's about to be used to build confidence in a rewrite of findloop.c in a followup commit. I also expect that it will be useful later on for testing other graph algorithms. This patch is not Amir's original. I've polished the code in various small ways. The biggest change is that when it outputs a failing graph, the graph is printed in the form of an Untangle game id, in the hope that that will make it possible to visualise easily while debugging the problem!