in dune istl the SeqGS preconditioner changed from a class to a typedef to SeqSOR. A typedef can not be explicitly instantiated, leading to a compiler error. This is resolved in this MR.
in dune istl the SeqGS preconditioner changed from a class to a typedef to SeqSOR. A typedef can not be explicitly instantiated, leading to a compiler error. This is resolved in this MR.