1. Department of Physics, University of Wuppertal, Wuppertal D-42097, Germany
2. Juelich Supercomputing Center, Forschungszentrum Juelich, Juelich D-52425, Germany
3. University of the Pacific, 3601 Pacific Ave, Stockton, CA 95211, USA
4. Albert Einstein Center for Fundamental Physics, Bern University, Bern, Switzerland
5. University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
6. Eotvos University, MTA-ELTE Lendulet Lattice Gauge Theory Group, Budapest, Hungary