By DIANE CARDWELL It may be almost a year later than originally expected, but Fraunces Tavern, where Gen. George Washington bade farewell to his officers at the end of the Revolutionary War and where patrons have been eating and drinking on and off since 1762, has finally taken a big leap forward in its reincarnation. The bar, operated by an Irish outfit called the Porterhouse Group, opened last night for the first time since closing in February, attracting a mellow crowd of industry insiders, people who worked on the project and longtime patrons drawn to the place’s sense of history...