update to py-pip-8.1.2

CHANGES since previous pkgsrc version:
* Don't attempt to wrap search results for extremely narrow terminal windows
  (:issue:`3655`).

**8.1.1 (2016-03-17)**

* Fix regression with non-ascii requirement files on Python 2 and add support
  for encoding headers in requirement files (:issue:`3548`, :pull:`3547`).

**8.1.0 (2016-03-05)**

* Implement PEP 513, which adds support for the manylinux1 platform tag,
  allowing carefully compiled binary wheels to be installed on compatible Linux
  platforms.

* Allow wheels which are not specific to a particular Python interpreter but
  which are specific to a particular platform (:issue:`3202`).

* Fixed an issue where ``call_subprocess`` would crash trying to print debug
  data on child process failure (:issue:`3521`, :pull:`3522`).

* Exclude the wheel package from the `pip freeze` output (like pip and setuptools).
  :issue:`2989`.

* Allow installing modules from a subdirectory of a vcs repository
  in non-editable mode (:issue:`3217`, :pull:`3466`).

* Make pip wheel and pip download work with vcs urls with subdirectory option
  (:pull:`3466`).

* Show classifiers in ``pip show``.

* Show PEP376 Installer in ``pip show`` (:issue:`3517`).

* Unhide completion command (:pull:`1810`).

* Show latest version number in ``pip search`` results (:pull:`1415`).

* Decode requirement files according to their BOM if present (:pull:`3485`,
  :issue:`2865`).

* Fix and deprecate package name detection from url path (:issue:`3523` and
  :pull:`3495`).

* Correct the behavior where interpreter specific tags (such as cp34) were
  being used on later versions of the same interprter instead of only for that
  specific interpreter (:issue:`3472`).

* Fix an issue where pip would erroneously install a 64 bit wheel on a 32 bit
  Python running on a 64 bit OS X machine.

* Do not assume that all git repositories have an origin remote.

* Correctly display the line to add to a requirements.txt for an URL based
  dependency when ``--require-hashes`` is enabled.

**8.0.3 (2016-02-25)**

* Make ``install --quiet`` really quiet. See :issue:`3418`.

* Fix a bug when removing packages in python 3: disable INI-style parsing of the
  entry_point.txt file to allow entry point names with colons (:pull:`3434`)

* Normalize generated script files path in RECORD files. (:pull:`3448`)

* Fix bug introduced in 8.0.0 where subcommand output was not shown,
  even when the user specified ``-v`` / ``--verbose``. :issue:`3486`.

* Enable python -W with respect to PipDeprecationWarning. (:pull:`3455`)

* Upgrade distlib to 0.2.2 (fix :issue:`3467`):

  * Improved support for Jython when quoting executables in output scripts.

* Add a `--all` option to `pip freeze` to include usually skipped package
  (like pip, setuptools and wheel) to the freeze output. :issue:`1610`.

**8.0.2 (2016-01-21)**

* Stop attempting to trust the system CA trust store because it's extremely
  common for them to be broken, often in incompatible ways. See :pull:`3416`.

**8.0.1 (2016-01-21)**

* Detect CAPaths in addition to CAFiles on platforms that provide them.

* Installing argparse or wsgiref will no longer warn or error - pip will allow
  the installation even though it may be useless (since the installed thing
  will be shadowed by the standard library).

* Upgrading a distutils installed item that is installed outside of a virtual
  environment, while inside of a virtual environment will no longer warn or
  error.

* Fix a bug where pre-releases were showing up in ``pip list --outdated``
  without the ``--pre`` flag.

* Switch the SOABI emulation from using RuntimeWarnings to debug logging.

* Rollback the removal of the ability to uninstall distutils installed items
  until a future date.

**8.0.0 (2016-01-19)**

* **BACKWARD INCOMPATIBLE** Drop support for Python 3.2.

* **BACKWARD INCOMPATIBLE** Remove the ability to find any files other than the
  ones directly linked from the index or find-links pages.

* **BACKWARD INCOMPATIBLE** Remove the ``--download-cache`` which had been
  deprecated and no-op'd in 6.0.

* **BACKWARD INCOMPATIBLE** Remove the ``--log-explicit-levels`` which had been
  deprecated in 6.0.

* **BACKWARD INCOMPATIBLE** Change pip wheel --wheel-dir default path from
  <cwd>/wheelhouse to <cwd>.

* Deprecate and no-op the ``--allow-external``, ``--allow-all-external``, and
  ``--allow-unverified`` functionality that was added as part of PEP 438. With
  changes made to the repository protocol made in PEP 470, these options are no
  longer functional.

* Allow ``--trusted-host`` within a requirements file. :issue:`2822`.

* Allow ``--process-dependency-links`` within a requirements file. :issue:`1274`.

* Allow ``--pre`` within a requirements file. :issue:`1273`.

* Allow repository URLs with secure transports to count as trusted. (E.g.,
  "git+ssh" is okay.) :issue:`2811`.

* Implement a top-level ``pip download`` command and deprecate
  ``pip install --download``.

* Fixed :issue:`3141`, when uninstalling, look for the case of paths containing
  symlinked directories (:pull:`3154`)

* When installing, if building a wheel fails, clear up the build directory
  before falling back to a source install. :issue:`3047`.

* Fix user directory expansion when ``HOME=/``. Workaround for Python bug
  http://bugs.python.org/issue14768, reported in :issue:`2996`.

* Fixed :issue:`3009`, correct reporting of requirements file line numbers
  (:pull:`3125`)

* Fixed :issue:`1062`, Exception(IOError) for ``pip freeze`` and ``pip list``
  commands with subversion >= 1.7. (:pull:`3346`)

* Provide a spinner showing that progress is happening when installing or
  building a package via ``setup.py``. This will alleviate concerns that
  projects with unusually long build times have with pip appearing to stall.

* Include the functionality of ``peep`` into pip, allowing hashes to be baked
  into a requirements file and ensuring that the packages being downloaded
  match one of those hashes. This is an additional, opt-in security measure
  that, when used, removes the need to trust the repository.

* Fix a bug causing pip to not select a wheel compiled against an OSX SDK later
  than what Python itself was compiled against when running on a newer version
  of OSX.

* Add a new ``--prefix`` option for ``pip install`` that supports wheels and
  sdists. (:pull:`3252`)

* Fixed :issue:`2042` regarding wheel building with setup.py using a different
  encoding than the system.

* Drop PasteScript specific egg_info hack. (:pull:`3270`)

* Allow combination of pip list options --editable with --outdated/--uptodate.
  (:issue:`933`)

* Gives VCS implementations control over saying whether a project
  is under their control (:pull:`3258`)

* Git detection now works when ``setup.py`` is not at the Git repo root
  and when ``package_dir`` is used, so ``pip freeze`` works in more
  cases (:pull:`3258`)

* Correctly freeze Git develop packages in presence of the &subdirectory
  option (:pull:`3258`)

* The detection of editable packages now relies on the presence of ``.egg-link``
  instead of looking for a VCS, so ``pip list -e`` is more reliable
  (:pull:`3258`)

* Add the ``--prefix`` flag to ``pip install`` which allows specifying a root
  prefix to use instead of ``sys.prefix`` (:pull:`3252`).

* Allow duplicate specifications in the case that only the extras differ, and
  union all specified extras together (:pull:`3198`).

* Fix the detection of the user's current platform on OSX when determining the
  OSX SDK version (:pull:`3232`).

* Prevent the automatically built wheels from mistakenly being used across
  multiple versions of Python when they may not be correctly configured for
  that by making the wheel specific to a specific version of Python and
  specific interpreter (:pull:`3225`).

* Emulate the SOABI support in wheels from Python 2.x on Python 2.x as closely
  as we can with the information available within the interpreter
  (:pull:`3075`).

* Don't roundtrip to the network when git is pinned to a specific commit hash
  and that hash already exists locally (:pull:`3066`).

* Prefer wheels built against a newer SDK to wheels built against an older SDK
  on OSX (:pull:`3163`).

* Show entry points for projects installed via wheel (:pull:`3122`).

* Improve message when an unexisting path is passed to --find-links option
  (:issue:`2968`).

* pip freeze does not add the VCS branch/tag name in the #egg=... fragment anymore
  (:pull:`3312`).

* Warn on installation of editable if the provided #egg=name part does not
  match the metadata produced by `setup.py egg_info`. :issue:`3143`.

* Add support for .xz files for python versions supporting them (>= 3.3).
  :issue:`722`.


(richard)