resolve https://issues.apache.org/activemq/browse/AMQ-2489 - duplicate delivery acks resulted in broker exceptions with client or inividual ack - delivery acks now only for unacked messages - down side is pending messages in broker remain on expiry awaiting ack from ackLaer that dependes on prefetch value - but this is reasonable and to be expected. they will be removed on close or subsequent acks in any event
resolve https://issues.apache.org/activemq/browse/AMQ-2487 - usage management of storecursor iterator was broken in that a browse would decrement the usage. memory management across move and retry operations is now correct. modified some tests to validate memory usage