Export final calibration result as a record

[FWuellhorst]

To make the use of the final calibration result easy, an export to a record should be implemented (as discussed).

In addition to the final values, the most relevant info about the calibration should also be in that record, e.g.:

Name: MODELNAME_Calibrated_DATEOFCALIBRATION.mo
Content:

record TestModel_Calibrated_20191204 "Final values of AixCaliBuHa-Calibration of Model AixCalTest.TestModel: 
  NRMSE = 0.002; Used Method: scipy_minimize - COBYLA"
  parameter Real V=0.02 "Calibrated in bounds min=%s, max=%s";
  parameter Real m_flow_nominal=0.02 "Calibrated in bounds min=%s, max=%s";
   
  annotation (Icon(coordinateSystem(preserveAspectRatio=false)), Diagram(
        coordinateSystem(preserveAspectRatio=false)));
end TestModel_Calibrated_20191204;

[FWuellhorst]

Related to this, it would make sense to also return the tuned parameters directly (similarly to how the final results of the sensitivity analysis are returned) or export the resulting parameters additionally in a format that can be easily read in within python (e.g. JSON).
For example in the following fashion at the end of the method def save_calibration_result(self, best_iterate, model_name, **kwargs) :

        # Save relevant results in JSON
        import json
        results_file_path = os.path.join(os.getcwd(), "calibration_results.json")
        try:
            with open(results_file_path, 'r') as json_file:
                parameter_values = json.load(json_file)
        except:
            parameter_values = {}
        new_parameter_values = dict(zip(list(self.tuner_paras.get_names()), best_iterate["Parameters"]))
        updated_parameter_values = {**parameter_values, **new_parameter_values}
        with open(results_file_path, 'w') as json_file:
            json.dump(updated_parameter_values, json_file , indent=4)