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LS: Add sign calculation based on submatrix method
Use submatrix method to perform the sign iteration. This can be activated by setting SIGN_METHOD to SUBMATRIX. For now, Newton-Schulz iterations of order 2 and 3 are implemented for the dense submatrices. This can easilly be extended by more iteration schemes. Co-authored-by: Robert Schade <robert.schade@uni-paderborn.de>
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