old_contents: from Camera import Camera
  from PSF import PSF
  from CCD import CCD
  from Cartographer import Cartographer
  
new_contents: import socket
  hostname = socket.gethostname()
  if 'antares' in hostname:
  	import matplotlib 
  	matplotlib.use('Agg')
subject: Tweak __init__.py so matplotlib doesn't need display, and can run on cluster.