WebOfTrust.getNewDatabaseConfiguration(): Add new Persistent classes

They were added in recent commits on this working branch.
SubscriptionManager.*ChangedNotification: Get rid of constructors which
eat SynchronizationContainer

- The class SynchronizationContainer was removed by a previous commit.
- Synchronizations will be stored as regular *ChangedNotification
objects instead.
- The code which used the constructors will be removed by the following
commits.
IdentitiesSubscription.storeSynchronizationWithoutCommit(): Implement
according to new architecture

- As specified at EventSource.setVersionID() and
BeginSynchronizationNotification.