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.
While I know that "rem" doesn't mean "remark" or "remember", I'd like not to have to even think about it.  "remove_modeltypes_format" is only three extra letters.  (If your really wanted to save typing, I'd leave out the "_modeltypes_" part since we already know we're in a model type.)