The real news about the slam-bang revival of Hello, Dolly! that just opened at the Shubert isn't what you think. Yes, it's Bette Midler's first-ever starring turn in a Broadway musical, and, you know what? She's darn good. (Not great.) If you can get a ticket—and that's a big if at this point—you'll discover that Midler is commanding, funny, and, when necessary, moving, and has more than the wattage needed to headline Jerry Herman and Michael Stewart's quintessential musical-comedy star vehicle. But we'll come back to her. What you may need to know first is that Hello, Dolly! itself is terrific, and that director Jerry Zaks and his unassailable company have elevated it to a stratospheric level. . . .