Zc.recipe.testrunner

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Feature Changes
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- Added optional option `environment` that allows defining a section in your
buildout.cfg to specify environment variables that should be set before
running the tests.

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Feature Changes
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- If the working directory is not specified, or specified as the empty
string, an empty part directory is created for the tests to run in.

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Bugs fixed
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- When:

+ the working-directory option was used,
+ and the test runner needed to restart itself
+ and the test runner was run with a relative path (e.g. bin/test)

then the testrunner could not restart itself successfully because the
relative path in sys.argv[0] was no-longer valid.

Now we convert sys.argv[0] to an absolute path.

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Feature Changes
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- Added a working-directoy option to specify a working directory for
the generated script.

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Updated to work with (not get a warning from) zc.buildout 1.0.0b10.

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Added a defaults option to specify testrunner default options.