remove space from install path
Fix JuliaLang/julia#6665

Provides airyx in addition to bessel[jyikh]x
Tweaks to StepRange: Take 2
Updates following discussion in JuliaLang/julia#6665

Rather than introducing bessel[hijky]x functions, introduce optional
positional argument to bessel[hijky] and airy for scaled version.
deprecate readsfrom/writesto in favor of simply using open on AbstractCmds, and support: open(cmd, mode) do io ... end
better rearrangement of try/catch block in open(f, cmds)
rm obsolete writesto docs
automatically NULL-terminate UTF16 data for passing to Windows (and similar) APIs
NULL-terminate UTF32String data for consistency; deprecate UTF32String(c::Char...) in favor of utf32(c...); add conversion to UTF32String from binary data that looks at the BOM
NEWS updates for UTF16String and UTF32String
added utfXX(ptr[,len]) functions analogous to bytestring, added WString and wstring aliases to make wchar_t* APIs usable
fix utf32/UTF32String mixup
add deprecation for UTF32String(s::String)
avoid deprecation warning in converting UTFxxString to equal-sized integer types
type typo (and regression test) in utfXX(::Ptr{IntXX})
return a Failure instead of rethrowing an expection in @test_throws
See: https://github.com/JuliaLang/julia/issues/7051
cosmetics: remove tab, fix alignment
Refactoring of folding functions: `foldl`, `foldr`, `mapfoldl`, and `mapfoldr`
Merge branch 'master' into dh/reduce3
test mapfoldl and mapfoldr + a bug fix to mapfoldr