pWarring factions in South Sudan sign another ceasefire agreement. Our correspondent tells us observers are cautiously optimistic that this time the deal may deliver an end to 15 months of bloody civil conflict.pbr Also, Nigeria claims to have seized back several towns from Boko Haram as the country braces itself for more militant attacks in the run up to elections. And IMF chief Christine Lagarde wraps up a three day visits to Senegal over the week-end with words of encouragement and advice.