Muslim rebels in the mainly Catholic Philippines began handing over their guns to independent foreign monitors Saturday, as part of a treaty aimed at ending a decades-long separatist insurgency that has left about 150,000 people dead.Just over a thousand guerrillas in the country's restive south were turning in 940 weapons in a single day, the start of a graduated decommissioning process that aims to turn the country's largest rebel force into a regular political party.The Moro Isla