Frank Hvam and Casper Christensen, the stars and writers of Denmark’s Klown, should find themselves in good company among the most prominent members of the raunchy comedy pantheon. Alternately, the remorselessly profane Danish duo might repulse their peers just as easily. Klown, the cinematic evolution of the television show Hvam and Christensen created and featured in together for four years, pushes every boundary of good taste with a smirk and a cackle; there’s gleeful deceit to how the film frequently builds toward redemptive kindness before pulling the rug out from under our feet. But if the film’s primary interest lies in taking the mickey out of Frank, Casper, and the audience, its…