By Daniel Trotta NEW YORK (Reuters) - The Clash may have proven true the rock 'n' roll axiom that it is better to burn out than fade away. Now they are attempting to show that no matter how a band exits the stage, it can always come back with a box set. Punk originals who went on to explore forms of reggae, jazz and rap, the band basically broke up just when they hit their commercial peak with the 1982 album "Combat Rock," their fifth and final studio album after bursting onto the scene with their eponymous first record in 1977. ...