Add support for custom ranking function #292
Closed
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This adds an option for g.graph().ranker to be a custom ranking function and makes rank a node attribute. Since edges between nodes with the same (manually determined) rank become possible, it also adds a function for counting crossings within a single layer.
Hopefully this PR resolves #289.
This PR is admittedly a duplicate/clone of #270. I'm not sure why that PR was closed as it's a useful feature, and one on which my project depends. As I'm not able to reopen that PR, I've created a new one.