Replace Pinv default with BackslashSolver for better performance and Windows compatibility#121

ChrisRackauckas-Claude wants to merge 4 commits intoJuliaLinearAlgebra:masterJuliaLinearAlgebra/AlgebraicMultigrid.jl:masterfrom

ChrisRackauckas-Claude:replace-pinv-with-backslash-solverChrisRackauckas-Claude/AlgebraicMultigrid.jl:replace-pinv-with-backslash-solverCopy head branch name to clipboard