Also added unit test "EventTest".

In interface "Model", added default method "update(final List<Event> events)" to process events instead of time steps.

Also, use this method directly in method "updateCallbacks()" of class "Simulation".

No errors occurred in first (manual) tests. In further steps, use "Event" classes everywhere where a simple "simTimeInSec" is used.

# Conflicts:
#	VadereSimulator/src/org/vadere/simulator/projects/ScenarioRun.java

implementation of Bitonic sort on the GPU.

See merge request !30

In "PostvisualizationWindow.java", added button to generate TikZ image.

increase the nTrail for the seating test since it is a test that involves probability therefore a larger sample is necessary.

synchronize scenarioStore access. Use exact exponential function for pedestrian and obstacle potential calculation

Remove reflection where reasonable; closes #91 and fixes #86

See merge request !28

Changed parameters for stair test cases (spawn pedestrians only at free spaces and use random positions for spawning).