Visualization options, flexibility for DMMHC and quality of life improvements

In this release, the size argument no longer has to be given to the forecasting functions after a DBN is created. It has been deprecated, and will be removed in future versions. For now, it just issues a warning. The DMMHC algorithm now supports specific blacklist parameters for inter-slice arcs. Quality of life improvements such as more informative exceptions and subnetwork visualization have been added.