, of Minnesota through NSF grants PHY-0941493 and CMMI-1462826 and the LMS at the Ecole Polytechnique during two consecutive, one-year post-doctoral fellowships in each Institution. The work of R. E. was supported by the NSF grants PHY-0941493 and CMMI-1462826 and by the LMS during several short visits. The authors acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing resources
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