renamed in Model: map_fields() to fields(), prepare_table() to table()

src/baseexpression.cpp

@@ -121,7 +121,7 @@ void BaseExpression::generate_from_model(Model & model)
 	{
 		before_generate_from_model();
 		dump_additional_info(model);
-		model.map_fields();
+		model.fields();
 		after_generate_from_model();
 	}
 }