[Ifeffit] Athena's new copy series functionality

Thank you Bruce for implementing the new "Copy Series" functionality into Athena. I often wasted too much time and button pushes trying various Rbkg, Kmin, and/or Kmax values to get a consistent background subtraction for visual inspection of my datasets. Now with a couple of clicks I can create a beautiful series of datasets varying the parameter of interest to create the overlay that I need to choose the appropriate background subtraction value. If you haven't tried this new feature in the latest version of Athena, I suggest you give it a try... Dave Barton