Fix bug where loading an OAR with a deeded parcel would always set the parcel owner ID to the estate owner even if the group UUID was present.

Aims to address http://opensimulator.org/mantis/view.php?id=6355
As part of this work, an incomplete IXGroupsData was added which currently only allows store/fetch/delete of group records
(i.e. no membership data etc)
This is subject to change and currently only an in-memory storage implementation exists for regression test purposes.

OpenSim/Framework/Serialization/ArchiveConstants.cs

@@ -154,6 +154,11 @@ namespace OpenSim.Framework.Serialization
             EXTENSION_TO_ASSET_TYPE[ASSET_EXTENSION_SEPARATOR + "trashfolder.txt"]          = (sbyte)AssetType.TrashFolder;
         }
 
+        public static string CreateOarLandDataPath(LandData ld)
+        {
+            return string.Format("{0}{1}.xml", ArchiveConstants.LANDDATA_PATH, ld.GlobalID);
+        }
+
         /// <summary>
         /// Create the filename used to store an object in an OpenSim Archive.
         /// </summary>