Pytest-cover

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* Fixed a race condition when running with xdist (all the workers tried to combine the files).

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* Avoid warning about missing coverage data (just like ``coverage.control.process_startup``).
* Don't setup the multiprocessing finalizer if there's no coverage active.

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* Renamed ``--cov-min`` to ``--cov-fail-under`` to be consistent with the new ``fail_under`` option in `coverage-4.0`.
* Changed ``--cov-report=term`` to automatically upgrade to ``--cov-report=term-missing`` if there's ``[run] show_missing = True`` in
``.coveragerc``.
* Changed ``--cov-fail-under`` to be automatically activated if there's a ``[report] fail_under = ...`` in ``.coveragerc``.

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* Fixed `.pth` installation to work in all cases (install, easy_install, wheels, develop etc).
* Fixed `.pth` uninstallation to work for wheel installs.
* Reverted the unreleased ``--cov=path`` deprecation.
* Removed the unreleased addition of ``--cov-source=path``.

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* Forked from the `2.0` branch of https://github.com/schlamar/pytest-cov/ - fixes include:

* No need to specify the source anymore via ``--cov``. The source settings from
``.coveragerc`` will be used instead.
* Support for ``--cov-min``.