Abstract

The authors acknowledge the financial support of the DFG-priority programme SPP1388 “Representation Theory” and Marsden Grants UOC0501, UOC1009 and UOA1021. Part of the research for this paper was carried out while the authors were staying at the Mathematical Research Institute Oberwolfach supported by the “Research in Pairs” programme. The second author acknowledges additional support from ERC Advanced Grant No. 291512. The authors are grateful to the referee for helpful suggestions, including a strengthening of Proposition 3.4.

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