Reintroduced change made by kejaed

- Reintroduced change made at commit 8338d93832972c99b1a5a104ee3c0b96394650d6:
  "Added import to compile on Processing 2.0b7
  As per http://code.google.com/p/processing/issues/detail?id=1475 some
  import statements need to be added to code with the Processing 2.0b7
  build. osPID_FrontEnd uses both File and FileNotFoundException, so all
  of java.io.* was included."

  (Change unintentionally remained commented-out after earlier testing.)