BROOKLYN-14: rebind policies in separate phase

- Only add policies+enrichers to entities after all entities have had
  their state set, and all relationships (parent-child, 
  group membership, locations) have been set up
- Also corrects spelling of “doReconsruct” in BasicPolicyRebindSupport
  etc
- Improves comments in RebindManagerImpl on rebind’s phases
conflicts w #34 which catch `Exception e` and do `rebindContext.getExceptionHandler().onAddPolicyFailed(entity, policy, e);`