Added more unicode sub/superscripts to Latex tab completions
simplify type unions after instantiation

ref #7017

before it was possible for Union(Vector{T},Vector{Float64}) to end up as
Union(Vector{Float64},Vector{Float64}) after substituting T.
improve docs for isready(). closes #7006
Merge branch 'master' of github.com:JuliaLang/julia
Merge pull request #7018 from lstagner/sub_super

Added more unicode sub/superscripts to Latex tab completions
fix #6980, method sorting bug
Pairwise BLAS-based sumabs and sumabs2

Also speed up sum/sumabs/sumabs2 for very small vectors
Merge branch 'sjk/pairwise-sumabs2'
remove redundant code for AsyncStream readline
use Any[] explicitly for a few things in Base that want it, to make it independent of the behavior of map()
Improve manual about array conversion in ccall

Fixes #7034.
Merge pull request #7037 from nalimilan/docs

Improve manual about array conversion in ccall
fix inconsistent representation of mutable flag in type decl syntax
Merge branch 'master' of github.com:JuliaLang/julia
Tweaks of maximum and minimum related functions
Merge pull request #7038 from lindahua/dh/maxmin2

Tweaks of maximum and minimum related functions
tweaks of prod functions
Merge pull request #7040 from lindahua/dh/prod2

tweaks of prod functions