Sailors prepare to board Argentinean frigate Libertad in Tema, Ghana on December 19, 2012, after an international tribunal ordered its release. An Argentinean warship has left Ghana after a UN court ordered its release following an injunction by a US hedge fund to detain it in Accra. Port spokesman Lawrence Atumbine said the Libertad set sail from the port of Tema after Ghana’s Supreme Court “nullified”...