Change LandDataSerializer deserialization so that in the future it won't care about extra elements or element order.

This brings it into line with other deserializations such as object and will improve future backward compatibility.

OpenSim/Framework/Serialization/External/UserProfileSerializer.cs

@@ -33,8 +33,11 @@ using OpenSim.Framework;
 namespace OpenSim.Framework.Serialization.External
 {
     /// <summary>
-    /// Serialize and deserialize region settings as an external format.
+    /// Serialize and deserialize user profiles as an external format.
     /// </summary>
+    /// <remarks>
+    /// Currently UNUSED.
+    /// </remarks>
     public class UserProfileSerializer
     {
         public const int MAJOR_VERSION = 0;