The world's French-speaking countries gathered in Tunisia on Saturday for talks focused on economic cooperation, but faced calls to do more to resolve international crises.The head of the International Organisation of La Francophonie (IOF) urged the organisation to use its clout in a world "fractured" by multiple crises."The IOF must remain a link that can be used to prevent tensions from degenerating into conflicts," said Louise Mishikiwabo, a former Rwandan chief diplomat.