add new SolverCoreExt and SolverCoreExtDev
since Sudoku implements Cloneable, throws CloneNotSupportedException is required

package com.livehereandnow.sudoku.util;

/**
 *
 * @author mark
 */
public class SolverCoreExt extends SolverCore{
   
    public SolverCoreExt(Sudoku s) throws CloneNotSupportedException {
        super(s);
        show(" === SolverCoreExt ===");
    }
    
}