Add specialization of ConstructionTraits for Richardson

Simon Praetoriusrequested to merge
simon.praetorius/dune-istl:issue/missing_richardson_construction_traits into master

Summary

This MR adds a missing specialization of the template ConstructionTraits for the sequential preconditioner Richardson.

Details

Since Richardson does not provide a matrix_type, also the SmootherTraits and DefaultConstructionArgs must be specialized.

Edited by Simon Praetorius

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