By FETHI BELAID / AFP Most Tunisian schools are cash-strapped and run down, but an innovative project has allowed one to become self-sustaining by generating its own solar power and growing its own food. Most Tunisian schools are cash-strapped and run down, but an innovative project has allowed one to become self-sustaining by generating its own solar power and growing its own food. Today the man behind the initiative hopes the success of the rural Makthar boarding school can serve as a model to improve the crumbling public school sector in the small North African nation. Entrepreneur Lotfi Ha…