[IronPython] Sys.exit request

[Paul Moore]

I did ask before but I guess it got lost.

Can the PythonSystemExitException please have the parameter passed to
exit in it

So if I do

exit(12)

Then I can do

Catch(PythonSystemExitException ex)
{
	if((int)ex.ExitCode == 12)
		.......
}