Enable applyExp to deal with non-Hermitian linear maps #410
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Added Arnoldi orthogonalization, restarting, and time step adjusting
Added unit test for applyExp with non-Hermitian linear map
Fix error in "assert(lanczos_vectors.size() == linear_comb.size());"
Fix error in data type
Fix error in "assert(lanczos_vectors.size() == linear_comb.size())"
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Added an Arnoldi method to build the Krylov subspace, a restarting procedure, and a time step adjusting scheme, though I didn't find a more graceful way to treat complex and real projected matrix HH separately.