Badly Drawn Boy played two shows at the Iron Horse in Northampton two Saturdays ago. We saw him in Boston on the first date of his first American tour back in 2000, and headed out to the Valley to catch him again, on the first date of his latest US tour. He was terrific, mostly just him, his guitar, and his harmonica, and played a relaxed set of songs from every album, even the one that’s still in the works, often starting and stopping songs he didn’t get quite right.