Patch: save inferior command line arguments

[Tom Tromey]

Keith> Stud! Hey, if you're bored, all you had to do is ask! I've got
Keith> plenty of things for you to do! :-)

I just wanted to make argument saving work.  I've been missing it.

Keith> Approved.

Keith> I hate to ask this, but could you also whack the one in
Keith> interface.tcl while you're at it?

No problem.  I'm checking it in as part of this patch.

Tom