The term 'Presidio Trust' has become an oxymoronThe Presidio Trust is a wholly owned government corporation created by Congress to manage the Presidio.The Presidio Trust is not a private fiefdom assigned to connive its way into granting Gap magnate Don Fisher his dream of creating a publicly-subsidized museum in his own honor. Somehow, however, nobody explained this nuance to Clay Harrell, the Trust's press flack, and, apparently, dissembler-in-chief.Early last week, acting on a tip that the Tru