Institute of Computational Science, ETH Zurich, Switzerland. bernd.fischer@inf.ethz.ch|Institute of Computational Science, ETH Zurich, Switzerland. bernd.fischer@inf.ethz.ch|Institute of Computational Science, ETH Zurich, Switzerland. bernd.fischer@inf.ethz.ch|Institute of Computational Science, ETH Zurich, Switzerland. bernd.fischer@inf.ethz.ch|Institute of Computational Science, ETH Zurich, Switzerland. bernd.fischer@inf.ethz.ch|Institute of Computational Science, ETH Zurich, Switzerland. bernd.fischer@inf.ethz.ch