Hunt flow Visualization

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Is your feature request related to a problem? Please describe. Hunt flow is a graph. May want to visualize it to get a better idea of the entire hunt. Jupyter notebook is not good at showing non-linear relations between cells, not to mention the multiple variables in one cell.

Describe the solution you'd like A new command is welcome to do this. And the implementation can take advantage of the information in VarStruct that tells the dependent variables.

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Will check #134 for this.