tokens: J.Z.G. and R.P.K. acknowledge support by the National Science Foundation under grant AST-1108906 and the hospitality of the Munich University Observatory where part of this work was carried out. B.D. is supported by a fellowship from the Royal Astronomical Society. B.P. is supported in part by the Programme National de Physique Stellaire of the INSU CNRS. S.J.W. and A.Z.B. acknowledge funding by the European Union (European Social Fund) and National Resources under the ARISTEIA action of the Operational Programme Education and Lifelong Learning in Greece.
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