Zope-error

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- Replace deprecated ``zope.interface.implements`` usage with equivalent
``zope.interface.implementer`` decorator.

- Drop support for Python 2.4 and 2.5.

- Sort request items for presentation in the error reporting utility.

- Don't HTML-escape HTML tracebacks twice.

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- Add explicit tests for escaping introduced in 3.7.3.

- Handing names of classes those string representation cannot
be determined as untrusted input thus escaping them in error reports.

- Fix tests on Python 2.4 and 2.5.

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- Escape untrusted input before constructing HTML for error reporting.

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- Set ``copy_to_zlog`` by default to 1/True.
Having it turned off is a small problem, because fatal (startup) errors
will not get logged anywhere.

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- Add test extra to declare test dependency on ``zope.testing``.

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- Clean up dependencies. Droped all testing dependencies as we only need
zope.testing now.

- Fix ImportError when zope.testing is not available for some reason.

- Remove zcml slug and old zpkg-related files.

- Remove word "version" from changelog entries.

- Change package's mailing list address to zope-dev at zope.org as
zope3-dev at zope.org is now retired. Also changed `cheeseshop` to
`pypi` in the package's homepage url.

- Add dependency on ZODB3 as we use Persistent.

- Use a mock request for testing. Dropped the dependency on zope.publisher
which was really only a testing dependency.

- Reduce the dependency on zope.container to one on zope.location by no
longer using the Contained mix-in class.