(actually) use hessenberg factorization for statespace freqresp #598
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The benchmarks show it's quite a lot faster than the previous

freqresp. The new version is labelled "large" because I had originally intended to use it for large systems only, but it turned out to be faster across the board. The benchmark is performed on a 2x2 system with varying order of the state, evaluating the freqresp on 200 frequency points.