QR via SparseColumnPivotedQR + minimum-norm least squares (lstsq)#6

ChrisRackauckas merged 2 commits into

mainSciML/SparseWithDenseRowColMatrices.jl:mainfrom

qr-scpqr-and-lstsqSciML/SparseWithDenseRowColMatrices.jl:qr-scpqr-and-lstsqCopy head branch name to clipboard