add missing doc to BasicStep, & remove useless field

 * @author Vincent Bourgmayer

 */

public class BasicStep implements IStep{

    public final static String LAST_STEP_KEY = "L"; //When a next step key has this value, it means that this is the last step of the process

    private final String type;

    private final int stepNumber; //This is the number of the step in the process

    protected String nextStepKey; //This is the key to the next Step

    private final int stepNumber; //= step index

    protected String nextStepKey; 

    /**

     * Create an instance of Step

     * @param type the type of the step

     * @param nextStepKey

     * @param stepNumber the number of the step in the whole process

     */

    public BasicStep(String type, String nextStepKey, int stepNumber) {

        this.stepNumber = stepNumber;

    }

    /**

     * Get the type of the step (Custom, CustomExecutable, Load, etc.)

     * @return String the value of the type

     */

    @Override

    public String getType() {

        return type;

    }

    /**

     * Get the index of the step in a given process

     * @return Int index of the step

     */

    @Override

    public int getStepNumber() {

        return stepNumber;

    }

    /**

     * Give the key of the step to load when this one will be achieved

     * @return String the next step key

     */

    @Override

    public String getNextStepKey() {

        return nextStepKey;