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      Also, just upgrade from a "developer" version to prod because
      none of this is really all that production quality anyway. Or
      rather... this is just as worthy anyway.

0.735_01 2006-07-31
      Added perlcall2/2.
      TODO: need ground/1 to constrain the 2nd arg to perlcall2/2.
      Added Scalar::Util to the pre-reqs. It was already required.
      Used Hash::Util::lock_keys to lock down object internals access.
      First release by JJORE.

0.734 2006-04-05
      Added minimum requirement of ExtUtils::MakeMaker 6.30 due to bug report
      filed on RT.  Thanks to zby for the catch.
      Added a copy of the Perl Review article on logic programming.  Thanks to
      brian d for and the Perl Review for allowing me to republish this
      article.

0.733 2005-10-08
      Added POD tests (sort of)
      Added strict to AI::Prolog
      Converted to Module::Build

0.732 Sat August 6, 2005
      Added lib/AI/Prolog/Cookbook.pm to the MANIFEST (whoops)

0.73  Sat August 6, 2005
      Added AI::Prolog::Cookbook as an introduction to common problems
        encountered when working with Prolog.
      TermList->to_string now causes listings to look very similar to
        SWI-Prolog.  Much easier to read.
      Term->to_string now identifies variables by letter, not /_\d+/.
      Completed decoupling of AI::Prolog::Parser from the engine.

0.72  Sun July 31, 2005
      Move builtins to their own class, AI::Prolog::Engine::Builtins
      Non-existent predicates now issue a warning even if trace is off.
      Added new predicates:
        halt/0 -- currently a no-op outside of the aiprolog shell
        help/0 -- list all builtin predicates for which help is available
        help/1 -- list help for builtin predicate
        write/1
        writeln/1
      Added ** operator (pow/1) to math preprocessor.  Leaving it out
        earlier was an oversight.

0.71  Sat June 25, 2005
      Removed _failgoal in Engine.pm.  We now backtrack if we need
        new results.
      Added several new regression tests.
      Fixed bug where code was not warning on unknown predicates.
        (Doug Wilson)
      Fixed bug where tracing fails when it tries to print a non-
        existent "next_clause".  (Doug Wilson)
      retract/1 now works correctly.  (Doug Wilson)
      Fixed unification bug that crept in in .62.
      Added data/sleepy.pro, a game that wasn't working because of
        the retract/1 bug.

0.7   Mon June 20, 2005 (Happy Birthday to me)
      Parsing errors now attempt to report the line number of the
        error.
      Added new predicates:
        consult/1
        listing/1
        ne/2
      Updated the license information display for aiprolog shell.
      Modified listing/0 to not show builtins.
      Added math preprocessor.  This transforms proper Prolog math
        into internal predicates the parser recognizes:

        X is N + 1. % is(X, plus(N, 1)).
        
      Pushed all parsing back to the Parser class.  No more parsing
        in TermList and Term :)
      Added anonymous variables:  foo(bar, _, baz).  I don't have
        any efficiency gains from this (yet) because they're just
        variables with hidden names, but they work.
      Added Test::Exception to the PREREQ_PM (thanks to rjray for
        pointing that out).
      Updated the docs and examples.

0.65  Wed May 11, 2005
      Added Term::ReadLine support to aiprolog shell.
      Added Term::ReadKey support to aiprolog shell.
      Minor doc corrections.

0.64  Mon May 09, 2005
      Change default behavior to AI::Prolog->raw_results(1).
      Added quote() method to allow Perl variables to be quoted
        and used at Prolog terms.
      Added list() method to allow a Perl list to be turned into
        a Prolog list.

0.63  Wed May 04, 2005
      Allow parser to properly handle positive and negative numbers
        and decimal points.
      Added pow(X,Y).
      Eliminated studlyCaps methods.
      Added trace. and notrace.
      Added a TODO test for a failing regression test.

0.62  Fri Feb 25, 2005
      Added code to avoid bug in some Perl's where "undef" looks
      like a number.
      Major performance improvement.  Now runs about 40% faster.
      Added 
        listing.
        println(X).
        is(X,Y).
        plus(X,Y).
        minus(X,Y).
        mult(X,Y).
        div(X,Y).
        mod(X,Y).
        ge(X,Y).
        gt(X,Y).
        le(X,Y).
        lt(X,Y).
      Added towers of hanoi and a scheduler to the examples/.

0.61  Mon Feb 21, 2005