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Muelu: Allow to change distributor options

James Willenbring requested to merge cgcgcg:mueluTpetraMatvec into develop

Created by: cgcgcg

@trilinos/muelu @trilinos/xpetra

Description

This PR adds the option to set a new sublist "matvec params" in the xml interface. The content of the sublist will be applied to the underlying Tpetra::Distributors for the solve phase. In particular, this allows to choose different communication options apart from the default Irecv-Send pattern.

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