text: U.S. Won't Release Female Iraq Prisoners BAGHDAD, Iraq - Authorities insisted on Thursday that they won't give in to militants' demands to free female Iraqi prisoners despite the plea of a tearful British hostage begging Britain to save his life in a video released by his captors.    Meanwhile, Iraq's most powerful Shiite cleric, Grand Ayatollah Ali al-Sistani, said that increasing violence must not be used as a pretext for delaying elections scheduled for late January...