Implement SIMD-optimized algorithm in 2 dimensions#93
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This PR builds on #92 (which added the
Simdpolicy to templates, but set this policy tofalse) by adding template specializations for the case<Dim=2, Simd=true>of all relevant data structures. It also includes benchmarks for these optimizations and makes the optimized build optional (for systems lacking the appropriate intrinsics). For now, some tests are run using only one of the two possible policies: Either with or without optimizations (depending on whether the underlying system supports them). However, both variants of the tests are run in CI (as different jobs).