Revert "Merge pull request #708 from mpriour/displayEvent"

This reverts commit 0b3f582e10, reversing
changes made to 74103ec3e0.

The reason for reverting this is a regression. See #997.

lib/OpenLayers/Map.js

@@ -2038,7 +2038,9 @@ OpenLayers.Map = OpenLayers.Class({
                         if (!inRange) {
                             layer.display(false);
                         }
-
+                        this.events.triggerEvent("changelayer", {
+                            layer: layer, property: "visibility"
+                        });
                     }
                     if (inRange && layer.visibility) {
                         layer.moveTo(bounds, zoomChanged, options.dragging);