Provides different types of meta-data about the primary growth models included
in biogrowth. This information is the basis of the automatic checks, and can also
help in the definition of models for predict_growth() and fit_growth().
primary_model_data(model_name = NULL)If model_name is NULL, returns a character string with the available models.
If is a valid identifier, it returns a list with metainformation about the model.
If model_name name is not a valid identifier, raises an error.
The name of the model or NULL (default).