Optimizer release

[Christian J Lebiere]

The parameter optimizer presented during a special session of the
workshop is available with ACT-R 4.0 on the ACT-R web site at:

http://act.psy.cmu.edu

This is essentially the version that was presented at the workshop,
somewhat cleaned up.  It is available as a Mac archive, and plain text
files for Unix and Windows platforms.  It consists of:

Optimizer: the code, which should be fully Common Lisp compliant.
Load Optimizer: a compiled version for MCL 4.0, ready to load.
                Note: you should always compile the code.
Documentation: a very brief description of how to use it, in MS Word 5.1.
3-Memory Test: an application to a test memory retrieval model.
Tower of Hanoi: an application to a simple tower of hanoi model.

This implements fairly standard OR techniques.  Depending on the model
that it is applied to, it may be slow or get stuck in a local minumum. 
It should however markedly improve your data fit given a decent starting
point.  Refer to the workshop proceedings for other ways of optimizing
model parameters.

This code is fairly stable but has seen fairly limited use.  Please send
me your feedback, suggestions, corrections, bug reports and other
desiderata at cl+ at cmu.edu.

Christian