Nearly all were for airline tickets, car rentals and other travel expenses, a hotel bill and $560 to ''Yankee-Nets, Inc.''Though this article quotes Giuliani spokesperson Sunny Mindel calling this ???much ado about nothing,??? and attributing the charges either to a trip taken on behalf of the Bush Administration or to a ???bookkeeping mix-up,??? I can find no report on Giuliani???s official respo