Finish getting rid of synchronized(<WebOfTrust>) in SubscriptionManager.run():
- Remove class InitialSynchronizationNotification: Instead of storing such a notification for triggering synchronization of the client, we now immediately synchronize the client upon creation of a Subscription. If we didn't use this solution, we would have to store serialized clones of the full dataset subject to synchronization - that would be a LOT of serialization and a rather large performance impact.
- This fixes the issue https://bugs.freenetproject.org/view.php?id=5988