JIHED ABIDELLAOUI TUNISIANS hoping to buy a sheep to slaughter for Islam's Eid al-Adha festival next week are facing much higher prices because of a drought, adding to public anxiety at an economic crisis that looks set to worsen. Small flocks of sheep are a common sight in Tunisian cities and towns in the run-up to the annual festival, feeding on highway verges and in empty lots as farmers bring in their animals from the countryside for sale. But the bleating that echoes across city neighbourhoods as families fatten animals on rooftops or in gardens may be heard less frequently this…