CollapsedIteration is a testing mode command that will iterate a model, collapse a single variable, and print the marginal, solution marginal, and error.

DotOutput reads a given model and outputs a graphviz description.

Execute adds all child commands to the root command and sets flags appropriately.

During startup in command line mode, we will panic on various errors.

DiscardJSON does nothing.

JSONLogger is a simple interface for JSON logging (matches json.Encoder) and nil/no-op implementation.