* Added basic 3-5 level undo on prim position/rotation/scale.

* In the future this should be a config option...   and, hopefully this tides the builders over for a little while.

OpenSim/Framework/IClientAPI.cs

@@ -570,6 +570,8 @@ namespace OpenSim.Framework
         event UUIDNameRequest OnTeleportHomeRequest;
         
         event ScriptAnswer OnScriptAnswer;
+
+        event AgentSit OnUndo;
          
         LLVector3 StartPos { get; set; }