Visual debugging tool

[Wikunia]

I would like to add a generic debugging tool to this which saves the tree nodes in a json file as this is extremely helpful in my ConstraintSolver project.
This project would simply need to create this JSON struct and I need to refine and publish my Javascript visual branch and bound debgugger then 😉

The "interface" can be seen here:
https://opensourc.es/blog/constraint-solver-bugs-and-benchmarks/#the_real_bug

[matbesancon]

duplicate of #12 ?

[Wikunia]

Bad Internet connection 😂