Add missing require for the tests
Fix tw.Param: the attribute is always defined and required.
s/setup/setUp/g
Fix tests
For genshi we should not call __call__ many times on the same the widget
Some refactoring
Display the onetoone field in a label when we view the data. In this way the HTML table is not too big according to the DB.
Use first the widget defined in the hint
Do not instantiate many times the widget in order to not have a validator defined by the __post_define__.
Do not force a validator if it is already defined.
Now we can pass a validator in the hint without overwriting it!
Sometimes we don't have any validator
Require the latest sieve.