Alkaline Trio, who in 1998 reinvented the scene with their seminal debut, Goddammit, have carved out their own nihilist niche in the dank macabre corner of pungent pop-punk rock, seem more wiling than ever to step into greener pastures with their latest release Agony & Irony. Though much of the initial appeal of Alkaline Trio was their rawness—Matt Skiba’s heart-impaled-with-knives voice, the cleverly chaotic simplicity in Dan Andriano’s melodies—that harkened back to the punk fundamental of a few guys sounding like a wannabe band trying on the fly to figure …