A list from which a marssm model will be constructed.
defaults
A list with the defaults for the elements in the model list in case the user leaves out any.
this.form.allows
A list of what inputs are allowed for each element in the model list.
Value
If the function does not stop due to errors, it returns an updated model list with missing elements filled in by the defaults.
Details
This is a helper function to check that all the model list that will be passed to a MARSS.form function to make the marssm object. If elements in the list are left off, they will be filled in by defaults.