We would like to thank O. Bergman, A. Hanany, J. Hayling, C. Papageorgakis, E.Pomoni, M. Sperling and J. Troost for very insightful comments and collaborations. D.R-G and A.B. acknowledge support from the EU CIG grant UE-14-GT5LD2013-618459, the Asturias Government grant FC-15-GRUPIN14-108 and Spanish Government grant MINECO-16-FPA2015-63667-P. D.R-G is partly supported by the Ramon y Cajal grant RYC-2011-07593. A.P. is supported by the German Research Foundation (DFG) via the Emmy Noether program “Exact results in Gauge theories”.
UE-14-GT5LD2013-618459 FC-15-GRUPIN14-108 MINECO-16-FPA2015-63667-P Ramón y Cajal Grant/RYC-2011-07593