Added a global "currying" function called "fix(func,...)"
that can be used to fix some arguments of a function while
allowing others to vary. The result is a function whose
arguments are only the variable components.

Ex:
    function muladd(a, b, c) { return a * b + c; }
    var line = fix(muladd, 2.0, undefined, 15.0); // a = 2.0, c = 15.0
    console.log(line(3.0)); // prints 21