Split inference of calib vs valid

Running BayesInference.create_inference with name='valid' vs 'calib' leads to two different use cases. Split the code to reflect this?

changed milestone to %2.0.0

added Inference Restructuring labels

marked this issue as related to #57 (closed)

For 'valid', the main goal is to obtain the BME of one model on one set of posterior samples.

Split into two different functions with !47 (merged)

closed