Detect and recover projectors that are ahead of the event store.

[dennisdoomen]

Adds a new options object that allows a subscriber to tell the dispatcher to restart the subscription at the first transaction available in the underlying event source, and allow the subscriber to clean-up just before that.

[dennisdoomen]

Adding another delegate would mean the subscription delegate will start to look like this;

    public delegate IDisposable CreateSubscription(long? lastProcessedCheckpoint,
        Func<IReadOnlyList<Transaction>, SubscriptionInfo, Task> handler, Func<Task> noSuchCheckpoint,
        string subscriptionId);

Feels a bit awkward. What do you think?

[dennisdoomen]

@IharBury please review again. I've applied your proposal.