Created a client driven packet throttler. The sim now respects the client's network throttle settings but does sanity checks to avoid too little(nothing gets sent) or too much(the sim crashes) data.

* Consider this experimental..   however, it looks very promising.

OpenSim/Framework/IClientAPI.cs

@@ -62,7 +62,9 @@ namespace OpenSim.Framework
         Cloud = 3,
         Task = 4,
         Texture = 5,
-        Asset = 6
+        Asset = 6,
+        Unknown = 7,
+        Back = 8
     }
 
     /// <summary>