Debugging

If the algorithm fail some debugging options are provided. The integer variable
Debug_Level_Solve_General_Interval indicate which level of debug is used:

• 0: no debug (the default value)
• 1: during the process are printed on the standard output: the index of the current box, the total number of boxes and the number of remaining boxes together with the current number of solutions
• 2 : same as 1 but the intervals of the current box are also printed and when it is split the new boxes are printed together with their function intervals