- provide mapping for commas in labels (__COMMA__) in
form-constraints together with fc_encode and fc_decode
- new method FormField->has_instance_variable to check
whether the formfield or a component has a certain
variable set to a certain value (used to detect,
if e.g. a compound form field contains a wym-weditor)
- new method FormField->process_user_input to
iterate over formfields before these are stored
- new method CompoundField->create_components to
factor out common code
- new method CompoundField->get_named_sub_component
to ease access of subcomponents