Which SIMD library should be supported by Dune?

For a couple of releases we support SIMD with the VcDevel library. In some future C++ release, this will probably become part of the C++ standard as std::simd.

OpenMP has similar capabilities with parallel pragmas. !1013 (merged) will add initial support in Dune.

What is the our strategy regarding SIMD libraries? Having just one? Which has more potential? Which is faster, easier to use? Could and should we support both libraries?