fix readdlm regression. fixes #6376

eltype checks for readdlm return values.
Merge pull request #6381 from tanmaykm/readcsv

fix readdlm regression. fixes #6376
Add uncommitted blob to update linalg tests (whoops)
Merge branch 'master' of https://github.com/JuliaLang/julia into appveyor2
debug msvc build