Zope-testing

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- Clean up support for displaying tracebacks with supplements by turning it
into an always-enabled feature and making the dependency on
``zope.exceptions`` explicit.

- Fix 251759: prevent the testrunner descending into directories that
aren't Python packages.

- Code cleanups.

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- Add zope-testrunner ``console_scripts`` entry point. This exposes a
``zope-testrunner`` script with default installs allowing the testrunner
to be run from the command line.

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- Fix bug when running subprocesses on Windows.

- The option ``REPORT_ONLY_FIRST_FAILURE`` (command line option "-1") is now
respected even when a doctest declares its own ``REPORTING_FLAGS``, such as
``REPORT_NDIFF``.

- Fix bug that broke readline with pdb when using doctest
(see http://bugs.python.org/issue5727).

- Make tests pass on Windows and Linux at the same time.

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- Filenames of doctest examples now contain the line number and not
only the example number. So a stack trace in pdb tells the exact
line number of the current example. This fixes
https://bugs.launchpad.net/bugs/339813

- Colorization of doctest output correctly handles blank lines.

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- Improve handling of rogue threads: always exit with status so even
spinning daemon threads won't block the runner from exiting. This deprecated
the ``--with-exit-status`` option.

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- Fix test failure on Python 2.4 due to slight difference in the way
coverage is reported (__init__ files with only a single comment line are now
not reported)

- Fix bug that caused the test runner to hang when running subprocesses (as a
result Python 2.3 is no longer supported).

- Work around a bug in Python 2.6 (related to
http://bugs.python.org/issue1303673) that causes the profile tests to fail.

- Add explanitory notes to ``buildout.cfg`` about how to run the tests with
multiple versions of Python