support consumer side reordering of messages by priority order
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                 Key: AMQ-1913
                 URL: https://issues.apache.org/activemq/browse/AMQ-1913
             Project: ActiveMQ
          Issue Type: New Feature
            Reporter: James Strachan
             Fix For: 5.3.0


we should be able to enable the in memory list of queues in a consumer to be 
sorted in some way (such as by priority) so that folks can get an easy priority 
queue. The downside is that messages won't be ack'd in the order in which they 
were dispatched.

Maybe its neater to add that into the broker dispatch - but given the 
complexity of the broker, I figured it was simplest to just add as an optional 
flag on the consumer side. In which case, once messages are reordered, the 
consumer would then ack specific messages rather than 'all messages up to 
message ID X' as is the default

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