Hook up dynafields in params.py
The helper method getDynaFields converts a list with dynafield dicts
to a dictionary with dynaproperties and is used to update the
create- and edit_dynaproperties dicts.
Patch by: Sverre Rabbelier
Benjamin Niemann <pink at odahoda dot de>: Main developer of Python target.
Clinton Roy <clinton.roy at gmail dot com>: AST templates and runtime.