Simple implementation of chmod(path, mode)

currently only integer modes, can do string modes like +x later
fixes #7574
Allow deletion of read-only files on Windows
NEWS for #7917
allow quoting all reserved words using `:` and no space. fixes #7872
Merge branch 'master' of github.com:JuliaLang/julia
begin 0.4 NEWS section
Add Profile.callers to determine main callers of a particular function
Merge pull request #7529 from JuliaLang/teh/whocalls

Add Profile.callers to determine main callers of a particular function
Merge pull request #7590 from tkelman/tk/chmod

Simple implementation of chmod(path, mode)
correction to unicode examples in REPL docs
Merge branch 'master' into unicodedocs