Dan Tangherlini On the heels of Nikita Stewart’s scoop last night that people have been getting vetting calls from the FBI about D.C. City Administrator Dan Tangherlini, D.C. Mayor Adrian Fenty called a 3 p.m. press conference today to announce a “Cabinet-level” personnel announcement. And the word has just come down: Tangherlini is off to Treasury, where he’ll serve as assistant secretary for management, chief financial officer, and chief performance officer. That’s sure a…