Improve node layout in automatic learning

Issue #267 new
Anonymous created an issue

When learning a Bayesian network in automatic mode, the nodes are created aligned in columns, and as result some arcs are hidden behind other arcs. For example, learn in automatic mode from Asia10k.cvs and you will need to move several nodes to see which arcs were really created. When learning in interactive mode, the nodes are created in a circle, which is MUCH better. Please, change automatic learning to also use circular layout.