ctbkgcube now produces a model container that replaces the original background model with a standard diffuse cube background model that can be used for stacked analysis. The model container can be either retrieved using the models() method, or it can be written to disk with the save() method.
Add MAGIC to the list of possible instruments (i.e. now all that are globals in GCTAObservation)
Add simulation and stacked in-memory analysis pipeline.