ack messages earlier for improved performance and reliability #1430
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Somebody had a complaint about the AMQP session dropping during long transfers... because it was idle while the transfers were going on.
One such discussion is #1411 ... where it talks about "a file transfer to take >60 seconds" where the real problem is that it will only ack any message in a batch after the entire batch has been attempted, which might take quite a while.
So with this change, each message is acknowledged individually ASAP, in download and send.