Second edit

1. The "attachment" property must be added to the widget.js file.

2. Took this off:
* You may have noticed that the date format is variable: it actually depends on today's date. It displays *hier* (yesterday) if the date was yesterday, only the time if it is today, or the full date. To do that, we have simply
defined a hook using the `setHook` method:
    wListView = Widget.create('wListView', undefined, {
        init: function() {
            this.setHook('date', function(dateStr) { return 'the date is: ' + str; })
        }
        });