BEIRUT (Reuters) - Syria denounced international envoy Lakhdar Brahimi as "flagrantly biased" on Thursday, casting doubt on how long the U.N.-Arab League mediator can pursue his peace mission. The Syrian Foreign Ministry was responding to remarks by Brahimi a day earlier in which he ruled out a role for President Bashar al-Assad in a transitional government and effectively called for the Baathist leader to quit. "In Syria... ...