- create a mode where no local files are accessed. (hmm, will
  that even block python library requests?... will need to
  whitelist that -- perhaps with generic whitelisting facility?)

- look through all modules to find holes... LOL.
  - os
  - os.path
  - shutil
  - fnmatch
  - glob
  - stat 
  - pathclass (https://wiki.python.org/moin/PathClass)

