Wrapper for multiple answer evaluators, allowing more than one answer evaluator to evaluate the student's answer.
pc_evaluator([ans_ev1, 1,"fantastic"},[ans_ev2, .5, "ok, but not great"], [ans_ev3, .1, "you need help"])
list with entries of the form: [answer_evaluator, partial credit factor, comment]
Applies evaluators from the list until it hits one with positive credit, weights it by the partial credit factor, and throws in its comment
Macro Definition File