change which to return rather than show
improve ability to use require from sysimg.jl
nnz -> countnz
removed deprecated 'dense' from manual
update helpdb.jl
Avoid promotion to dense matrix in eigs.
Fix fields name in Hessenberg and remove inner constructor.
flipsign implementation for Float32 and Float64.
Update zlib URL for win-extras
Relax linalg tests.
lex dot-relational operators the same as other dot operators. fixes #5689
getaddrinfo is now exported; remove Base prefix in manual
fix rsearch of char to return 0 for not found. fixes #5679

fix getindex of SubString with out of bounds indexes
Implement UDP
Document svd thin keyword argument and deprecate old versions.
Return vector for vector right hand side in least squares.
Add SharedArray utilities, expand documentation, add a few tests
Concretely specify the type of dims in SubArray

This allows the type of `size(S::SubArray)` to be inferred.
add pointer(s) for strings, change UTF32String.chars to .data for consistency
add UndefVarError type for undefined variable errors