Possible to construct circular dependencies in models if not created through dict

[ourmoa]

This model should not be possible to create
model = cc.StingyConfigurator( pg.All(*"AB"), pg.AtMost(2, ["x", "y", "z"], variable="A"), pg.All(*"gef", variable="B"), pg.All(*"Abc", variable="g"))
Add a validation function on the model, do not forget to include this on every plog model, not just the StingyConfigurator

[znittzel]

We choose to allow constructing models with circular dependencies since we favor speed over user friendly api's. To be consistent, we change the puan.logic.plog.from_dict function instead to allow circular dependencies