Establish Util.ToRawUuidString to get LLUUIDs in unhyphenated form

Apply method to UUID crud in SqliteInventoryStore as an initial test
This appears now to successfully recover inventory upon login
This will almost certainly only work on standalone

OpenSim/Framework/Util.cs

@@ -383,5 +383,15 @@ namespace OpenSim.Framework
         {
             return Math.Min(Math.Max(x, min), max);
         }
+        
+        /// <summary>
+        /// Convert an LLUUID to a raw uuid string.  This is a string without hyphens.
+        /// </summary>
+        /// <param name="lluuid"></param>
+        /// <returns></returns>
+        public static String ToRawUuidString(LLUUID lluuid)
+        {
+            return lluuid.UUID.ToString("n");
+        }
     }
 }