Zope-app-wsgi

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- Add pluggability for setting up WSGI middleware in testlayer.

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- Python 2.7 compatibility for xmlrpc. Transplant of zope.app.testing r116141.

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- Fixed test breakage due to changes in mechanize 0.2.0.

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- Add support for testing XMLRPC using zope.app.wsgi.testlayer.

- Fix a bug in the status string handling in zope.app.wsgi.testlayer's
FakeResponse.

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- Return a FakeResponse object in zope.app.wsgi.testlayer.http,
so it becomes easier to port over tests from zope.app.testing's
HTTPCaller.

- X-Powered-By header is now stripped by zope.app.wsgi.testlayer as
it is by zope.app.testing.

- Bugfix: initialize any <logger> defined in the config, as
zope.app.server does. (Fixes 291147)

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- zope.app.wsgi.testlayer is now a lot more compatible with
the HTTPCaller() functionality in zope.app.testing, which it can
replace:

- same transaction behavior - pending transactions are committed
before request and synchronized afterwards.

- support for browser.handleErrors (for zope.testbrowser).

- support for clear-text (non-base64) Basic authentication headers,
which are easier to read in the tests (though not correct in
actual HTTP traffic).