Plone-testing

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Rerelease of 4.2.0 as 5.0.0.

The version 4.2.0 had changed error handling in the public api, causing exceptions where before everything continued to work.

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New:

- Refuse to work if user breaks test isolation.
[do3cc]
- Check that tests don't run together with ZopeTestCase
[do3cc]

Fixes:

- Fix tests for Zope 4, where the app root Control_Panel is not available anymore.
[thet]

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Fixes:

- Rename all txt doctest files to rst. Reformat doctests.
[thet]

- PEP 8.
[thet]

- Depend on zope.testrunner, which was moved out from zope.testing.testrunner.
[thet]

- Add support for Zope 4.
[thet]

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- Prevent exception masking in finally clause of zopeApp context.
[do3cc]

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- Rerelease for clarity due to double release of 4.0.13.
[maurits]

- Added ``multiinit``-parameter to z2.installProduct to allow multiple initialize methods for a package
[tomgross]

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- Really fix not to depend on unittest2.
[icemac]

- Add tox.ini
[icemac]