CRITIC AT LARGE
Bernstein's Broadway, the road not taken by Ed Siegel</b><br /> With both "West Side Story" and "Candide" being revived locally this week -- "West Side Story" at the North Shore Music Theatre, "Candide" at the Boston Conservatory -- and with Bernstein's 1953 musical "Wonderful Town" being revived on Broadway next month, it's worth asking what would have happened if Bernstein, rather than Sondheim, had been the major …