Refs #131 actually we can simply replace the field that stores the recurrence.
No upgrade step necessary, because existing data is kept
update Changes for #131
Merge branch 'remove-recurrence-field-131'
Replace RecurrenceField with plain Text field in the dx recurrence behavior. This reverts the change from 1.0rc2. We don't use form schema hints but an adapter to configure the widget. Closes #137, Fixes #131.