Reporting queue sizes at activities as "tokens waiting for resource"

[ldugan]

Some sim/mod vendors with their own sim language show queue sizes as a proxy indicator for backlog. BPSim, to my knowledge, does not have this covered. When pressed with the need to report it for a client, Lanner & Trisotech gave me the vendor extension below to use, which was very helpful. I would like BPSim to address this need ASAP. The results set returned by this is the max, min, and mean of queue size as understood as # of tokens waiting for a resource.

                     <VendorExtension name="l-sim-task-results-v1">
                        ...
                        <lsim:MaximumNumberOfTokensWaitingForResource>
                            <ResultRequest>max</ResultRequest>
                        </lsim:MaximumNumberOfTokensWaitingForResource>
                        <lsim:MinimumNumberOfTokensWaitingForResource>
                            <ResultRequest>min</ResultRequest>
                        </lsim:MinimumNumberOfTokensWaitingForResource>
                        <lsim:AverageNumberOfTokensWaitingForResource>
                            <ResultRequest>mean</ResultRequest>
                        </lsim:AverageNumberOfTokensWaitingForResource>
                        <lsim:MaximumNumberOfResourcesUsed>
                            <ResultRequest>max</ResultRequest>
                        ...
                    </VendorExtension>

[SimonRinguette]

At the face to face meeting in montreal (July 2016) we have decided to add a property parameter called queueLength for query only