Stop NPC's getting hypergrid like names in some circumstances.

This meant punching in another AddUser() method in IUserManagement to do a direct name to UUID associated without the account check (since NPCs don't have accounts).
May address http://opensimulator.org/mantis/view.php?id=5645

OpenSim/Region/Framework/Interfaces/IUserManagement.cs

@@ -5,13 +5,48 @@ using OpenMetaverse;
 
 namespace OpenSim.Region.Framework.Interfaces
 {
+    /// <summary>
+    /// This maintains the relationship between a UUID and a user name.
+    /// </summary>
     public interface IUserManagement
     {
         string GetUserName(UUID uuid);
         string GetUserHomeURL(UUID uuid);
         string GetUserUUI(UUID uuid);
         string GetUserServerURL(UUID uuid, string serverType);
-        void AddUser(UUID uuid, string userData);
+
+        /// <summary>
+        /// Add a user.
+        /// </summary>
+        /// <remarks>
+        /// If an account is found for the UUID, then the names in this will be used rather than any information
+        /// extracted from creatorData.
+        /// </remarks>
+        /// <param name="uuid"></param>
+        /// <param name="creatorData">The creator data for this user.</param>
+        void AddUser(UUID uuid, string creatorData);
+
+        /// <summary>
+        /// Add a user.
+        /// </summary>
+        /// <remarks>
+        /// The UUID is related to the name without any other checks being performed, such as user account presence.
+        /// </remarks>
+        /// <param name="uuid"></param>
+        /// <param name="firstName"></param>
+        /// <param name="lastName"></param>
+        void AddUser(UUID uuid, string firstName, string lastName);
+
+        /// <summary>
+        /// Add a user.
+        /// </summary>
+        /// <remarks>
+        /// The arguments apart from uuid are formed into a creatorData string and processing proceeds as for the
+        /// AddUser(UUID uuid, string creatorData) method.
+        /// </remarks>
+        /// <param name="uuid"></param>
+        /// <param name="firstName"></param>
+        /// <param name="profileURL"></param>
         void AddUser(UUID uuid, string firstName, string lastName, string profileURL);
     }
 }