Hello, Zheng Junjie!

Thank you for the patch review!  I fixed most of the issues that you
mentioned.

> maybe gnu/packages/graph.scm better here

I don't think that "graph.scm" is a good place for "bin-graph" as this
is not a tool for working with images only but more like a tool for
visualizing the insides of binaries.  It's closer to reverse-engineering
realm than to image processing realm.

- avp

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