From Rob Smart <SMARTROB@uk.ibm.com>

In SL if llAbs() is called with the minimum integer value of -2147483648
it will return that value untouched without error.

this patch replicates the SL functionality.

OpenSim currently throws an overflow exception: number too small under
mono or a "System.OverflowException: Negating the minimum value of a
twos complement number is invalid. " under .NET

OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs

@@ -361,7 +361,11 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
 
         public LSL_Integer llAbs(int i)
         {
+        	// changed to replicate LSL behaviour whereby minimum int value is returned untouched.
             m_host.AddScriptLPS(1);
+            if(i == Int32.MinValue)
+                return i;	
+            else
             	return (int)Math.Abs(i);
         }