Solves sudoku grids
Menu "Grilles incomplètes" allows to select an incomplete grid among
more than 20 from various sources.
Menu "Maximum d'itérations" allows to set the maximum number of
evaluations.
Button "Résolution" runs the solver for the selected grid.
Button "Problèmes" draws all the incomplete grids of the database in
succession ( one per second )
Button "Sortie" leaves the program.
The solver stops only once the maximum number of evaluations has been reached,
which is a bug to correct in later versions.
