by Amaury HAUCHARD PICTURES BY JOHN WESSELS Agence France-Presse TICHITT, Mauritania (AFP) — A few centuries ago, Tichitt was a citadel of trade where Saharan merchants bearing gold, salt and cloth would stop to water their camels and haggle. Today, red-and-white signs in the sand dunes point to where this once great hub of commerce and centre of Islamic culture lies. But visitors to Tichitt, a UNESCO world heritage site, are few now, and the great […]