It was one chance group of collaborations between one of the most acclaimed indie-rock frontmen and a celebrated electronic producer – arguably both similar to and unlike anything either man had done before. And, bolstered by some unforgettable songs, it’s a collaboration from which the world anxiously awaits more. Now, there is more – sort of: The Postal Service, the duo of Death Cab for Cutie’s Ben Gibbard and Jimmy Tamborello, will expand and reissue their sole LP, Give Up, with a bonus disc of rare and unreleased material (including two new tracks)…