Support for QueueDeclareFull, which gives number of messages and consumer #2
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I added this support because 1) AMQP supports it 2) it is useful :)
For me this is a very useful feature, as in my application I have to know when a queue becomes empty (e.g. to start workstealing from another queue), and there is no other reliable way to do that (I don't want to use BasicGet, because I'm consuming the queue) and to distinguish between "queue is really empty" and "broker is too busy to push messages to me".
I ran my application with this change and it worked. Unfortunately the built-in tests hung for me in the Debug configuration; not sure what's wrong (I was running on VS2010), so I wasn't able to run them.