by Alan SculleyJohnny Rzeznik, singer/guitarist in the Goo Goo Dolls, is no songwriting neophyte. He's been the band's chief tunesmith throughout its decades-long history, and he's written (or occasionally co-written) an enviable number of hit songs, with tunes like "Iris," "Slide" and "Name" highlighting the group's dozen pop hits.But over the course of writing and recording the band's ninth album, Something for the Rest of Us, Rzeznik says he was faced with dry periods when ideas just weren't flowing."It's really frustrating," says Rzeznik. "It's kind of scary looking at the blank page. You