- Use default and defaultFactory properties for behavior schema definitions to
  provide sane defaults for z3c.form *and* programmatically created Dexterity
  types (e.g. via plone.dextterity.utils.createContentInContainer). For that to
  work, remove the Behavior factory classes, use the default AttributeStorage
  and let IEventBasic and IEventRecurrence behaviors derive from IDXEvent resp.
  IDXEventRecurrence.

- Remove data_postprocessing event subscriber.
test fixes pt 2
rm stale pdb