Trigger feature related events with feature information and layer related events with layer information. Also adding events.on and events.un convenience methods. r=crschmidt (closes #1343)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@6149 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/OverviewMap.js

@@ -154,9 +154,11 @@ OpenLayers.Control.OverviewMap = OpenLayers.Class(OpenLayers.Control, {
             this.minimizeDiv = null;
         }
         
-        this.map.events.unregister('moveend', this, this.update);
-        this.map.events.unregister("changebaselayer", this, 
-                                    this.baseLayerDraw);
+        this.map.events.un({
+            "moveend": this.update,
+            "changebaselayer": this.baseLayerDraw,
+            scope: this
+        });
 
         OpenLayers.Control.prototype.destroy.apply(this, arguments);    
     },