further performance improvements

[Marcus G. Daniels]

With the updates below, batch Java heatbugs running on Sun JDK for
Windows can run about 80% the number of steps per unit time as
Objective C heatbugs.  Performance will vary per model, of course.  If
you avoid memory allocation, use createFAction instead of
createActionTo, and compile the model with GCJ, I'll go so far as to
say it is possible to exceed the performance of the same model
implemented in Objective C.  (The garbage collector with the GCJ
runtime doesn't seem to be as fast as Sun JDK, but the generated code
generation is faster than the Sun JIT.)

Source code:

  ftp://ftp.swarm.org/pub/swarm/src/testing/swarm-2001-07-14.tar.gz

Windows binaries:

  ftp://ftp.swarm.org/pub/swarm/binaries/w32/latest/javaswarm.dll.gz
                                                    libkaffeswarm.dll.gz
                                                    swarm.jar.gz
                                   

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