By Ulf Laessing NEAR SOFIYA, Sudan (Reuters) - In a hangar-shaped factory hall in central Sudan a dozen workers rush to pack refined white sugar gushing from a funnel into paper bags to be loaded on three trucks parked outside. Next year, the management at Kenana Sugar Company hopes the plant will be even busier as it plans to boost its output as the African country seeks to increase sugar exports. Faced with the loss of most oil production after South Sudan seceded in 2011, Sudan has been scrambling to find new sources for state revenues and dollars to pay for imports. ...