Global creator information working on MySQL DB and on load/save OARs. Creator name properly shown on the viewer as first.last @authority.

New option added to save oar -profile=url. Migration on RegionStore making CreatorID be 255 chars.
Moved Handling of user UUID -> name requests to a new module UserManagement/UserManagementModule.

OpenSim/Region/Framework/Interfaces/IUserManagement.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+
+using OpenMetaverse;
+
+namespace OpenSim.Region.Framework.Interfaces
+{
+    public interface IUserManagement
+    {
+        string GetUserName(UUID uuid);
+        void AddUser(UUID uuid, string userData);
+    }
+}