Non-FOGI-compatible functions

[juangmendoza19]

While playing around with FOGI models, I noticed that the method print_parameters_by_op(self, max_depth=0) in model.py has not been updated to work with FOGI models. To be more specific, it seems like self.parameter_labels cannot be expected to always hold operator parameter labels anymore, but model parameter labels.

Environment :

• pyGSTi v0.9.11.1