mperrin/webbpsf — pull request #14 by embray (2013-12-13 15:41:49+00:00)
Title: Improve GUI selection somewhat to fall back on Tk when wx is unavailable

One more small PR. I ran into this since I don't have wx on my machine, whereas *most* Python users should have Tkinter so I improved the GUI selection to fall back on Tkinter if wx fails.