Evacuation processors return *always* positive time

They also have a positive value when:

• No agent reached the target
• Some agents are still in the scenario
• A source still spawns agents into the scenario

If a user is not aware of this property, then a wrong evacuation time (too small) is used. So it is extremely important that a the simulation time is set large enough. It is also not possible to detect whether all agents made it to the target.

See files:

• TestPedestrianEvacuationTimeProcessor
• TestEvacuationTimeProcessor
• EvacuationTimeProcessor
• PedestrianEvacuationTimeProcessor
• PedestrianEndTimeProcessor

When solving this issue also consider to add a check in TestOptimizationMetricNelderMeadProcessor whether all agents reached the target.