Message 219237 - Python tracker

I am currently in the process of editing this patch such that the Turtle Demo launches from the Help Menu and spawns a separate process. 

However, I am deciding whether if the separate process should be asynchronous or not. Currently, I have it working with the subprocess module, but the IDLE window is hanging. 

I can use the multiprocess module or Popen to make it asynchronous. However, I am not sure where the clean-up should happen once the turtle process has been terminated.