MYCIN-style inference

This library enables MYCIN-style inference using "certainty factors" on rules.

Example (using examples/age.pl):

?- use_package(mycin).
?- use_module(age).
?- senior(X) cf CF.

CF = -0.8,
X = angel ? ;

CF = -0.6656,
X = frank ? ;

CF = 1.0,
X = uncle_tom ? ;

See files at examples/ for more examples.