Undo/redo fully working

Normand Briere

2019-06-11 1d909ffa0c2beb51d453b53b845c4f3a749ca5f0

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//package edu.wlu.cs.levy.CG;
 
public class KDException extends Exception {
    protected KDException(String s) {
        super(s);
    }
    public static final long serialVersionUID = 1L;
}