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 - Now uses regular XS instead of Inline for the C code parts. [patch
   by Matt Sergeant]

 - Converted the inner loop of the best_attr() method to C code,
   because it was spending a lot of time in accessor methods for the C
   structures it was using.  Don't worry, I'm not going C-crazy.  I
   won't be making many (any?) more of these kinds of changes, but
   these ones were probably necessary.

 - Removed a bit of debugging code that I left in for 0.03.

0.03  Mon Sep  2 11:41:18 AEST 2002

 - Added a 'prune' parameter to new(), which controls whether the tree
   will be pruned after training.  This is usually a good idea, so the
   default is to prune.  Currently we prune using a simple
   minimum-description-length criterion.

 - Training instances are now represented using a C struct rather than
   a Perl hash.  This can dramatically reduce memory usage, though it