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Add option to change the algorithm to rank according the the longest path to the node instead of the shortest. This variant results in path always going down (I hope) and never to the same level or up.
The second change is to add empty spots so that path going to more than 1 rank down do not cross through nodes in the intermediate ranks...
One issue I face and haven't solve is that the algo change to get the longest path will make an infinite loop if there is a loop in the graph...