ODEPlugin

* Added osSetPrimFloatOnWater(BOOL) to make Physical prim float at the water level.   
* osSetPrimFloatOnWater(TRUE); or osSetPrimFloatOnWater(FALSE);
* By default, prim do not float at the water level.
* More work is needed on the floating, but it's a start.

OpenSim/Region/ScriptEngine/Common/LSL_BuiltIn_Commands_Interface.cs

@@ -648,6 +648,7 @@ namespace OpenSim.Region.ScriptEngine.Common
         void osRegionNotice(string msg);
 	    bool osConsoleCommand(string Command);
         void osSetParcelMediaURL(string url);
+        void osSetPrimFloatOnWater(int floatYN);
 
     }
 }