[eigen] Alternative SVD bidiagonalization

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Apparently this is DGESDD or DGESSD that is in LAPACK and is now the preferred method for computing a SVD. It uses some sort of divide and conquer for computing the SVD of a bidagonal matrix instead of QR iterations.

http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.41.5864


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