When the Boston Chowhound board starts mooning over a restaurant two months prior to its opening, there's a pretty safe bet something special's a'brewin'. In this case, the "something" was Chris Schlessinger (East Coast Grill, formerly of Blue Room), and the "special" was his newest venture, the All-Star Sandwich Bar, a small yet breathable joint that embraces a wide variety of meat-on-bread and eschews the trendy wrap without compunction. The first thing a budget-conscious diner......