MIAMI — Federal prosecutors have filed an appeal with a Miami judge seeking to overturn a Denver court’s decision that allowed an American man accused of sexually abusing boys at a Haitian orphanage to be sent to a halfway house until trial. Earlier this month, Magistrate Judge Scott Varholak in Colorado denied a request by federal prosecutors to detain Michael Karl Geilenfeld, 71, after he was indicted on Jan. 18 by a grand jury in Miami. Geilenfeld, who was arrested in Denver, is accused of traveling from Miami to Haiti 14 times between November 2006 and December 2010 to engage in “illicit s…