make constructors created by OpenLayers.Class call the parent's initialize method rather the parent constructor, this is to accomodate usage patterns of IGN's GeoPortal API, r=ahocevar (closes #3454)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@12215 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/BaseTypes/Class.js

@@ -37,7 +37,7 @@ OpenLayers.Class = function() {
 
     var C = typeof F.initialize == "function" ?
         F.initialize :
-        function(){ P.apply(this, arguments); };
+        function(){ P.prototype.initialize.apply(this, arguments); };
 
     if (len > 1) {
         var newArgs = [C, P].concat(