Fruitful discussions with S. Malinowski, S. Sarkar, J. Schumacher, and R. Shaw are gratefully acknowledged. Partial financial support was provided by the Deutsche Forschungsgemeinschaft, SPP 1276 Metström program. Computational time was provided by the German Climate Computing Center in Hamburg and by the Jülich Supercomputing Centre. This research was supported in part by the National Science Foundation under Grant NSF PHY05-51164 and we thank the kind hospitality of the Kavli Institute for Theoretical Physics.
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