Jens Lekman just makes us happy. Last night at Neumo's, the sweet Swede gave a joyful pop performance, not too different from his show last fall, except now his all-girl backing band is smaller--only four members, two of which (including opener, My Brightest Diamond's Marla Hansen) are actually from the States--and this time around everyone was in grey instead of white. The only other dude on stage, Viktor Per Sjöberg, mans the laptop and......