Sweeney Todd **1/2 - The Crucible **** - Fidelio****
By: David Sheward Opera and theater merge and meld in two offerings at this summer's Glimmerglass Music Festival in Cooperstown, NY. Stephen Sondheim and Hugh Wheeler's 1979 Broadway bloodbath Sweeney Todd receives a confused staging while Robert Ward's 1961 operatic adaptation of The Crucible, Arthur Miller's drama of the Salem witch trials, succeeds with a more straightforward production. Luretta Bybee as Mr…