* move shell completion scripts to where can be auto picked up

Let's use switching new remote as opportunity to put shell completion
scripts to where they should be and avoid git conflict during the process.

* add Library/Formula and Library/Aliases symlinks

Formulae and Aliases has been relocated to homebrew/core tap.
The symlinks are pointed to new location to keep backward compatibility.

* remove formula_renames and tap_migrations

They have been replaced by the json files in the core tap.

* update: set new remote

* bump Homebrew version to 0.9.9

Fixes Homebrew/homebrew#50651

We should remove PR lock files in the test tap rather than HOMEBREW_REPOSITORY.

This reverts commit 51e4e6490bda0d981afd1787a6392ab588b0601c. This did
not work as intended, as the `git` command is executed in the context of
the tap the current job operates on, never for Homebrew/homebrew itself.

Wipe everything from the Homebrew prefix except for the `Library/Taps`
directory to avoid having to refetch `homebrew/core` every time.

`install_name_tool` location depends on the location of the active developer
directory managed by `xcode-select`.

Closes Homebrew/homebrew#50509.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#50635.

Signed-off-by: Xu Cheng <xucheng@me.com>

Closes Homebrew/homebrew#50632.

Signed-off-by: Xu Cheng <xucheng@me.com>

Closes Homebrew/homebrew#49904.

Signed-off-by: Xu Cheng <xucheng@me.com>

It will pull legacy formula PR from Homebrew/homebrew
TODO: remove it when it's not longer necessary

So we can know whether a Homebrew installation is pre or post
core/formula separation.

Will update to 0.9.9 when moving core code to new repo.

Fix the `brew tests` problem caused by core/formula separation.

All formulae are in taps now.

Update the description update logic, since now all formulae are in the taps.

Update the report logic, since now all formulae are in the taps.

We don't need to migrate the tapped formulae from symlink-based to
directory-based structure any more.

Instead, we add core tap install check for `brew update-report` which
will be invoked by `brew update`.

Also make `Homebrew/homebrew` as an alias of this tap to keep
backward compatibility.

It will be auto installed whenever necessary.

* Count .DS_Store disk usage but not file count.
* Count symlink's own disk usage instead of ignoring it.
* Count hardlinks disk usage only once.
* Add testcase.

Closes Homebrew/homebrew#50563.

Closes Homebrew/homebrew#50566.

Signed-off-by: Xu Cheng <xucheng@me.com>

i.e. Ignoring the file's directory for version parsing.

Closes Homebrew/homebrew#50568.

Signed-off-by: Xu Cheng <xucheng@me.com>

"--fast-math" caused build failure with clang for
homebrew/science/delly-0.7.2

Apparently, clang only likes this option when it's referred to as
"-ffast-math"

Closes Homebrew/homebrew#50507.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

Ensure we don't munge line endings on checkout regardless with user's
global git config.

Closes Homebrew/homebrew#50514.

Signed-off-by: Xu Cheng <xucheng@me.com>

Closes Homebrew/homebrew#50537.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

Don't use ensure to do the final check because it won't affect the
return value of the overall function.

Thanks to @xucheng for catching this bug.

Closes Homebrew/homebrew#50536.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

SDK 10.10 isn't something that exists for Xcode 7, so stop looking for
it and rely on MACOSX_DEPLOYMENT_TARGET instead.

See PR Homebrew/homebrew#50137 Yosemite build failure

Closes Homebrew/homebrew#50355.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>