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6.0.0.0
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- added randomVector, gaussianSample, meanCov

- added rankSVD, nullspaceSVD

- rank, nullspacePrec, and economy svd defined in terms of ranksvd.

- economy svd now admits zero rank matrices and return a "degenerate
  rank 1" decomposition with zero singular value.

- added NFData instances for Matrix and Vector.

- liftVector, liftVector2 replaced by mapVector, zipVector.