Made OARs use the new serialization procedure. (TPs/crossings still on the old one) Added an options argument down the pipeline. For the time being it takes --old-guids as an option to produce <Guid> instead of <UUID>.

OpenSim/Region/Framework/Interfaces/IRegionSerialiserModule.cs

@@ -117,6 +117,6 @@ namespace OpenSim.Region.Framework.Interfaces
         /// </summary>
         /// <param name="grp"></param>
         /// <returns></returns>
-        string SerializeGroupToXml2(SceneObjectGroup grp);
+        string SerializeGroupToXml2(SceneObjectGroup grp, Dictionary<string, object> options);
     }
 }