Cambodia's United Nations-backed war crimes tribunal has sentenced the first Khmer Rouge official to be tried for crimes against humanity to 35 years imprisonment.  Kaing Guek Eav, better known as Comrade Duch, admitted overseeing the deaths of up to 15,000 people who entered Tuol Sleng, the prison where  enemies of the regime were sent.  He is also guilty of rape and torture.  International and Cambodian judges today sentenced him to 35 years in jail, but because he was found to have been held illegally for five years by the Cambodian military, they reduced …