It would be easy, Goo Goo Dolls' singer and guitarist John Rzeznik admits, to tour and just play “Iris,” “Name” and the rest of songs fans know by heart — to be a barnstorming greatest hits attraction and forego releasing new material, like the Goo Goo Dolls did earlier this year with “Boxes.”But Rzeznik, who appears with the band Nov. 13 at the Palace Theatre in Greensburg, resists complacency.“I think I still have something to write,” Rzeznik says. “Whether anybody wants to listen or not, that's another thing.”If fans take the time to listen to “Boxes,” they'll find a few surprises. The albu