Z3c.layer.pagelet

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- Sets HTTP status code to 500 on system errors but only in devmode and in
tests.

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- Re-release of 1.8.1 as the changes in it require a new major release
because they broke `z3c.authviewlet`.

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- Re-release of 1.8.0 as the changes in 1.8.1 require a new major
release because they break `z3c.authviewlet`.

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- Doing redirect in ``UnauthorizedPagelet`` now in ``update`` method instead
of ``render`` so the layout templage does not get rendered when
redirecting.

- Fixed tests: Using manager account, so anonymous user does not need to get
all permissions for running tests successfully.

- Got rid of `zope.app.testing` test dependency by using `zope.app.wsgi`.

- Got rid of `zope.app.authentication` test dependency.

- Added a test for ``403 Forbidden``.

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- Requiring `zope.login` so tests run with `zope.publisher` >= 3.12.

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- Added i18n domains to templates, so they can be translated. (Done
using `z3c.locales`.)