set_types
Description:
Sets the types of the columns inside a Model.
Note: 
      
        
    
    Use ListModel instead
This function is meant primarily for Objects that inherit from Model, and should only be used when contructing a Model. It will not work after the initial creation of the Model.
Parameters:
| this | 
           a Model  | 
      
| types | 
           an array of Type types  | 
      
| n_columns | 
           number of columns for the model  |