Add TestOsNpcLoadAppearance()

OpenSim/Framework/AvatarAppearance.cs

@@ -330,6 +330,9 @@ namespace OpenSim.Framework
             SetVisualParams(visualParams);
         }
 
+        /// <summary>
+        /// Set avatar height by a calculation based on their visual parameters.
+        /// </summary>
         public virtual void SetHeight()
         {
             // Start with shortest possible female avatar height