If you wrote a terrific batch of material as a young artist, would you immediately set out to record it, or would you put it into a time capsule, bury it and think, “This might come in handy in 50 years”? Historically, not many singer-songwriters or bands have taken the latter option. But Squeeze did — effectively, if not as a conscious decision — and now it’s finally paying off as the band’s new album, “Trixies,” makes good on an early promise with a unique instance of very delayed