If you took Coolidge Corner and moved it to San Francisco, you'd wind up with something very much like West Portal, a nicely-kept secret neighborhood with folksy shops and restaurants and a theater, about a 10-minute subway ride from the Castro. And get this: it's about to get even nicer, thanks to some sprucing-up by Muni. "Underinvestment in the Muni system has brought us to a point where we cannot postpone this work," says......