On branch master
 Changes to be committed:
  Usually when exceptions occur, threads should exit the program
  themselves, but now the main thread also tracks when other threads
  terminate for any reason and exits the program if any have
  terminated.

	modified:   bot-threads.rkt
    The thread launching function returns a list of the thread values
    corresponding to the threads it launches.

	modified:   streams-polling-threads.rkt
    The thread launching function returns a list of the thread values
    corresponding to the threads it launches.

	modified:   zxqStreambot.rkt
    Main thread now checks whether any other threads have terminated
    and exits the program if they have.