- In z3c.form based Dexterity forms, use plone.autoform form hints for widget
  parameters and remove the ParameterizedWidgetFactory. plone.autoform 1.4
  supports widget parameter form hints.
- For the recurrence behavior In z3c.form based Dexterity forms, use the
  RecurrenceField instead of a plain Text field. This ensures that the
  recurrence widget is used even for plain z3c.form forms without form schema
  hints.
merge with master
forwards compatible change note
Merge branch 'dx_form_refactorings' of git://github.com/plone/plone.app.event into dx_form_refactorings