use shared symlink pkg cache on Windows newer than XP
Test approximate over exact equality.
Fix #9103, implementing `cd -` in REPL shell mode
cleanup julia_init options

moves all configuration options into jl_compileropts
compute the abspath/realpath of file paths in the config to avoid issues with chdir
Modal prefix history search.

Attempt to deal with down arrow better at end of history.
Refine prefix matching condition to consider mode changes as different.
Pass thru keypresses to parent mode.

Update lineedit test for new usage.
Cleanup some mess with types in LineEdit.jl
Use parent prompt indent.
Remove one unnecessary layer of anonymous functions.
Passthru escape sequences.
Preserve mode when editing history.
Drop unknown codes at REPL.

Better than producing an EOF error.
Use language: julia in default .travis.yml

and add the os: section for mac testing (has to be explicitly enabled
by sending an email to support@travis-ci.com, see
http://docs.travis-ci.com/user/multi-os )
add git fetch --unshallow in commented out script section

add explanatory comment
Keep cursor at prefix position.
Make SubArrays immutable

Since #8867 this actually makes a difference in the optimizations LLVM
is able to perform.
Merge pull request #8992 from ntessore/pr-415e392

Test gamma function approximate over exact equality for non-OpenLibm
Merge pull request #9322 from JuliaLang/sjk/immutable-subarray

Make SubArrays immutable
Fix problem with UMFPACK finalizers. Test wrappers for all combinations of value and index types. Add separate umfpack test file.