Add a 'More' control to the applications display in the overlay

mode. When this control is clicked, documents display section slides down,
workspaces display slides to the side, and a multi-column applications view is
presented to the user. "More' control is replaced with a 'Less' control. When
the 'Less' control is clicked a default overlay view is restored.

Clean up positioning of the components of the overlay sideshow
and the items within generic item displays.


svn path=/trunk/; revision=179

js/ui/appDisplay.js

@@ -220,7 +220,7 @@ AppDisplay.prototype = {
 
     // Creates an AppDisplayItem based on itemInfo, which is expected be a GAppInfo object.
     _createDisplayItem: function(itemInfo) {
-        return new AppDisplayItem(itemInfo, this._width);
+        return new AppDisplayItem(itemInfo, this._columnWidth);
     } 
 };