don't translate error message and replace console log with exception

lib/OpenLayers/Format.js

@@ -6,8 +6,6 @@
 /**
  * @requires OpenLayers/BaseTypes/Class.js
  * @requires OpenLayers/Util.js
- * @requires OpenLayers/Console.js
- * @requires OpenLayers/Lang.js
  */
 
 /**
@@ -104,7 +102,7 @@ OpenLayers.Format = OpenLayers.Class({
      * Depends on the subclass
      */
     read: function(data) {
-        OpenLayers.Console.userError(OpenLayers.i18n("readNotImplemented"));
+        throw new Error('Read not implemented.');
     },
     
     /**
@@ -118,7 +116,7 @@ OpenLayers.Format = OpenLayers.Class({
      * {String} A string representation of the object.
      */
     write: function(object) {
-        OpenLayers.Console.userError(OpenLayers.i18n("writeNotImplemented"));
+        throw new Error('Write not implemented.');
     },
 
     CLASS_NAME: "OpenLayers.Format"