Parallel Computing and Complex Systems Group, University of Leipzig, Fraunhofer Institute IZI, Leipzig, Germany. merkle@informatik.uni-leipzig.de|Parallel Computing and Complex Systems Group, University of Leipzig, Fraunhofer Institute IZI, Leipzig, Germany. merkle@informatik.uni-leipzig.de|Parallel Computing and Complex Systems Group, University of Leipzig, Fraunhofer Institute IZI, Leipzig, Germany. merkle@informatik.uni-leipzig.de|Parallel Computing and Complex Systems Group, University of Leipzig, Fraunhofer Institute IZI, Leipzig, Germany. merkle@informatik.uni-leipzig.de|Parallel Computing and Complex Systems Group, University of Leipzig, Fraunhofer Institute IZI, Leipzig, Germany. merkle@informatik.uni-leipzig.de|Parallel Computing and Complex Systems Group, University of Leipzig, Fraunhofer Institute IZI, Leipzig, Germany. merkle@informatik.uni-leipzig.de|Parallel Computing and Complex Systems Group, University of Leipzig, Fraunhofer Institute IZI, Leipzig, Germany. merkle@informatik.uni-leipzig.de|Parallel Computing and Complex Systems Group, University of Leipzig, Fraunhofer Institute IZI, Leipzig, Germany. merkle@informatik.uni-leipzig.de|Parallel Computing and Complex Systems Group, University of Leipzig, Fraunhofer Institute IZI, Leipzig, Germany. merkle@informatik.uni-leipzig.de