DETROIT — A federal judge Friday sent back to prison an Ypsilanti ex-con accused of buying dangerous weapons while under court supervision and downloading Islamic State manuals for making bombs, explosives and poisons. The order by U.S. District Judge Terrence Berg comes one week after Yousef Mohammad Ramadan was temporarily jailed amid government complaints that the ex-con was violating conditions of supervised release imposed as part of his conviction on three gun charges. That case followed an FBI counterterrorism investigation that portrayed Ramadan as an ardent ISIS supporter and dangerou…