Zope-testrunner

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- Running layers in sub-processes did not use to work when run via
``python setup.py ftest`` since it tried to run setup.py with all the
command line options. It now detects ``setup.py`` runs and we run the test
runner directly.

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- Fix ``SkipLayers`` class in cases where the distribution specifies a
``test_suite`` value.

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- Fixed a bug in the `ftest` command and added a test.

- Fixed a trivial test failure with Python 3 of the previous release.

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- Expose `ftest` distutils command via an entry point.

- Added tests for ``zope.testrunner.eggsupport``.

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- Dropped use of 2to3, rewrote source code to be compatible with all Python
versions. Introduced a dependency on `six`_.

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- Dropped use of zope.fixers (LP: 1118877).

- Fixed tox test error reporting; fixed tests on Pythons 2.6, 3.1, 3.2, 3.3 and
PyPy 1.9.

- Fix --shuffle ordering on Python 3.2 to be the same as it was on older Python
versions.

- Fix --shuffle nondeterminism when multiple test layers are present.
Note: this will likely change the order of tests for the same --shuffle-seed.

- New option: --profile-directory. Use it in the test suite so that tests
executed by detox in parallel don't conflict.

- Use a temporary coverage directory in the test suite so that tests
executed by detox in parallel don't conflict.

- Fix --post-mortem (aka -D, --pdb) when a test module cannot be imported
or is invalid (LP 1119363).