Cleanup and improvements to the txn commit system. We now ensure: a) if the txn consists only of acks, we do sync those acks in the qi (assuming the acks were on disk already); b) txns in non-durable queues never cause fsyncs, even if the messages are persistent (or the acks are for persistent messages); c) transactions which contain no publishes can now overtake txns which do contain publishes; d) txns which do not need to be sync'd in the qi can overtake those that do need to be sync'd in the qi (eg a txn with only acks for non-persistent msgs can overtake a txn with persistent publishes). The overtakings are all safe as commit is a sync operation on a channel, and can only overtake other txns, not other operations in general.

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