Fix typo in --help for --no-deps option

Assign pip config command summary correctly

Updated get_terminal_size to check for shutil.get_terminal_size first.

Add auto completion of short options

Improve message when setuptools is missing (PEP 518)

Fix for issue 5085 (--user set in config causes pip wheel to fail)

Update vendored libraries

Merged/9.0.3

Keep install options in requirements.txt from leaking

Mostly indentation complaints, plus an unused test parameter, fixed.
Leaves one new pylint complaint, which is about a test function naming
issue which affects every test.

The list of install options passed into the setup routine is mutable,
passed by reference, so adding items for "this package" to that list
mutates the options for all subsequent packages.

Isolate the lists before mutating them.

Includes a functional test, which has been confirmed to fail without
this fix.

Fixes #3763
Fixes #4453
Fixes #5089

Fixes to vendoring scripts so they work on Windows

Remove test_basic_install_environment_markers

This test relies on buggy setuptools behaviour (keeping
requirements with environment markers in install_requires,
rather than moving them to extras_require) which has been
fixed in recent setuptools versions.

Document PEP 518 support

Fix the date in the changelog

Merged/9.0.2