Changelog for hmatrix- ======= - added randomVector, gaussianSample, uniformSample, 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.