DHAKA, Bangladesh - In the last days of the bloody war that created this nation out of the eastern half of Pakistan in 1971, a gang of men abducted Dr. Alim Chowdhury, an eye surgeon and independence activist, from his home. Three days later, his battered body was found in a mass grave, his eyes gouged from his head.  His killers, members of a pro-Pakistan militia, were never punished. Moulana Abdul Mannan, the man who confessed to orchestrating the killing, according to a government investigation, went on to become a cabinet …