Get osNpcCreate appearance working with avatars that are currently in the scene.

Had to stop using AvatarService for now since it doesn't store baked texture IDs (which is why this was failing).
Also failing because cloning appearance was also cloning the AvatarApperance.Owner field, which we weren't then changing.
Extended TestCreate() to check this.

OpenSim/Framework/AvatarAppearance.cs

@@ -77,7 +77,11 @@ namespace OpenSim.Framework
         public virtual Primitive.TextureEntry Texture
         {
             get { return m_texture; }
-            set { m_texture = value; }
+            set
+            {
+//                m_log.DebugFormat("[AVATAR APPEARANCE]: Set TextureEntry to {0}", value);
+                m_texture = value;
+            }
         }
 
         public virtual AvatarWearable[] Wearables