Z3c.formwidget.query

----------------

* If one of the values to be displayed provides IRoleManager,
then check for permission first.
[frapell]

----------------

* Use an ordered list instead of a set to represent source items.
[timo]

----------------

* Add an ignoreMissing parameter and widget subclasses to avoid errors when
rendering missing values.
[elro]

* Create changelog file.
[dukebody]

* Respect the ignoreRequest parameter.
[dukebody]

----------------

* ...

----------------

* ...