Significantly rewritten to handle many lurking bugs.

- reorganized into functions with a small amount of __main__ code

- re-ordered the way the work gets done between the parent and the
  child.  it was possible the gate_watermarks file would be
  continuously trashed because it was written by every child process,
  which run asynchronously.  now only the parent writes this file, but
  it does so after each list's gating child process starts.

  This also means that the parent is what makes the initial NNTP
  connection, and gets the stats of the list (e.g. first and last).
  These it passes to the child process, along with the current
  watermark.  The child just does the actual gating.

- Added a per-list locking file so that only one gate_news process
  will be gating a list at any one time.  What happens is: the parent
  acquires the per-list lock.  If that fails, it just moves on to the
  next list; gate_news runs again in 5 minutes anyway, and the
  hung_timeout on the lock is set to 4 minutes.

  If the parent gets the per-list lock, it forks a child to handle
  gating that list.  The child then steals the lock from the parent
  (this should be safe), gates all the new messages, and then releases
  the per-list lock.

This new code should be forking-safe, should not have run away
processes, and lets you run gate_news from the command line without
interfering with any cron spawned gate_news process.

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