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- Always print start and flip events.  Add the newline before the
  stats back.

records).

Report distribution of "current file" bit.

  trace data; first and last timestamp, and their difference in
  seconds; how many records had their version bit set.

 - All large numbers reported are formatted with commas
   (e.g. '1,234,567').

records.  This is much faster (the old code took 16 second to write
120,000 records on my home box, the new code takes about 2.7 seconds).

A new script, stats.py, is provided to analyze statistics.