By Geraldine Freedman/For The Leader-Herald Opera Saratoga's production of “Don Pasquale” opened Saturday night at the Universal Preservation Hall and for all accounts it's a hit. From the terrific singing to the tight ensemble work, the show breathed fun and laughter for the large crowd, which raucously and constantly showed its pleasure with huge applause and hoots of delight. This is the fifth time over the company's many years that it has presented the opera, written by Gaetano Donizetti for an 1843 premiere. What's made this production memorable, however, is how skillfully and cleverly it has been updated, particularly in…