Run slow operations in a separate thread, instead of using FireAndForget (which has a 1-minute timeout)

Resolves http://opensimulator.org/mantis/view.php?id=6945

OpenSim/Framework/Util.cs

@@ -2319,6 +2319,29 @@ namespace OpenSim.Framework
 
         #endregion FireAndForget Threading Pattern
 
+        /// <summary>
+        /// Run the callback on a different thread, outside the thread pool. This is used for tasks
+        /// that may take a long time.
+        /// </summary>
+        public static void RunThreadNoTimeout(WaitCallback callback, string name, object obj)
+        {
+            Thread t = new Thread(delegate()
+            {
+                try
+                {
+                    Culture.SetCurrentCulture();
+                    callback(obj);
+                }
+                catch (Exception e)
+                {
+                    m_log.Error("Exception in thread " + name, e);
+                }
+            });
+            
+            t.Name = name;
+            t.Start();
+        }
+
         /// <summary>
         /// Environment.TickCount is an int but it counts all 32 bits so it goes positive
         /// and negative every 24.9 days. This trims down TickCount so it doesn't wrap