ANGUS McDOWALL  LYBIA’S best chance of peace in years is at risk of unravelling as factions tussle over looming national elections that were envisaged as a way to end a decade of chaotic division. As a cast of factional leaders position themselves for a presidential run, many Libyans are bracing for a return to violence whether the vote goes ahead as planned on December 24 or not. Already, the eastern commander Khalifa Haftar has paved the way for a campaign by handing his duties to an acolyte, while Saif al-Islam Gaddafi, the son of the former dictator, has indicated he…