Code to define modeltype RM-2380

create a modeltype table used by models and pfts. The table is
initialized with the types already in the models (not pfts). All models
and pfts are associated with a modeltype next.
User can add/edit modeltypes and see the pfts/models associated with it.
I'm surprised this even works since the correct name for the class is "Model".  But even though it _does_ work, I think it would be less confusing to use "Model" here and on line 13 (which also does work).