Ftw.testbrowser

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- Fix error in z3cform choice collection widget when using paths.
[jone]

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- Add a z3cform choice collection widget.
This is used for z3cform List fields with Choice value_type.
[jone]

- Add select field node wrapper with methods for getting available options.
[jone]

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- browser.open(data): support multiple values for the same data name.
The values can either be passed as a dict with lists as values or as
a sequence of two-element tuples.
[jone]

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- Fix browser.url regression when the previous request raised an exception.
[jone]

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- Make NoElementFound exception message more verbose.
When a `.first` on an empty result set raises a NoElementFound
exception, the exception message now includes the original query.
[jone]

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- Fix browser cloning regression in autocomplete widget "query".
The cloned browser did no longer have the same headers / cookies,
causing authenticated access to be no longer possible.
[jone]

- New browser.clone method for creating browser clones.
[jone]

- Update standard page objects to accept browser instace as keyword arguments.
This makes it possible to use the page objects with non-standard browsers.
[jone]