2004-06-22 - v0.6:
   * Add efficiency display.
   * Add par1 support.
   * Fix crc32 values not being byte-swapped.
   * Don't trust length field if par2 packet md5 fails.
   * Add test suite.
   * Python 2.3 or newer is now required.

2003-07-23 - v0.5:
   * Initial public release.