Patch from funky_c to move all alert()s in the library to a single

OpenLayers.Console.userError function. This allows for easy overriding of this
function for people who need to report errors at an application level (or
hiding these errors entirely), with the same default behavior as previous
releases. Patch from funky_c, r=me, (Closes #1651)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@7675 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Vector.js

@@ -109,7 +109,7 @@ OpenLayers.Layer.Vector = OpenLayers.Class(OpenLayers.Layer, {
 
     /**
      * APIProperty: reportError
-     * {Boolean} report error message via alert() when loading of renderers
+     * {Boolean} report friendly error message when loading of renderer
      * fails.
      */
     reportError: true, 
@@ -271,7 +271,7 @@ OpenLayers.Layer.Vector = OpenLayers.Class(OpenLayers.Layer, {
      */
     displayError: function() {
         if (this.reportError) {
-            alert(OpenLayers.i18n("browserNotSupported", 
+            OpenLayers.Console.userError(OpenLayers.i18n("browserNotSupported", 
                                      {'renderers':this.renderers.join("\n")}));
         }    
     },