A student from Indonesia was identified as Britain’s most prolific rapist on Monday after being convicted of more than 150 offences, including 136 rapes.In four separate trials, Reynhard Sinaga, 36, was found guilty of assaulting 48 men whom he drugged after taking them back to his apartment from outside bars and clubs in the city of Manchester.Many of the victims were lured by the offer of a place to sleep or more drink, and Sinaga filmed the assaults on his mobile phone, the Crown Prosecution…