* @param liste character Chain describing the various values.
* Labels are separated by '\\'.
* No case sensitive.
* @param usage Usage program (displayed if label not found)
* @return int : range of value amongst the values list
*/
* @param liste character Chain describing the various values.
* Labels are separated by '\\'.
* No case sensitive.
* @param usage Usage program (displayed if label not found)
* @return int : range of value amongst the values list
*/