EMMA FARGE THE trial of a former Liberian commander accused of rape, pillage, assassinations, and an act of cannibalism opens in Switzerland this week. The trial of Alieu Kosiah, who denies the charges, is one of just a handful of cases brought before international courts in relation to the West African country's 1989-2003 conflict, which killed nearly a quarter of a million people, often at the hands of child soldiers. He is accused of war crimes listed as "recruitment and use of a child soldier, forced transportation, looting, cruel treatment of civilians, attempted murder, murder (directly or by order), desecration…