fix: new tiramisu version support

src/rougail/config/__init__.py

@@ -290,7 +290,6 @@ types:
 functions_files:
   description: {_("File with functions")}
   help: {_("This file contains filters and additional Jinja2 functions usable in structure files")}
-  alternative_name: c
   type: unix_filename
   params:
     allow_relative: true

src/rougail/user_data.py

@@ -496,7 +496,7 @@ class UserData:
             # it's a function
             params = tuple([ParamValue(val) for val in value[1:]])
             value = Calculation(value[0], Params(params, kwargs={"option": ParamValue(option)}))
-            option.forcepermissive()
+            option = option.forcepermissive
             add_validation = True
         else:
             add_validation = False