Test some more types in FieldMatrix test

Tobias Leibnerrequested to merge
(removed):simd_in_fmatrixtest into master

This merge request also tests float, std::complex<double> and Vc::SimdArray<double, 8> in the inversion test in fmatrixtest.cc. For the simd part to compile, I had to specialize IsNumber for Vc::SimdArray<T, N>. Is that reasonable, @joe, or should I instead add a specialization to the DenseMatrixAssigner? Also, I changed std::swap to swap in the invert function, similar to the swap in luDecomposition. Depends on !449 (merged).

Edited by Tobias Leibner

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