As Mark Rylance returns to the West End stage as the rambunctious Rooster in Jez Butterworth's shaggy state-of-the-nation play, six writers consider its power and legacy It was the play that had critics searching for superlatives and audiences queueing out of the door. When Jerusalem opened at London's Royal Court in 2009, it developed a near-mythical reputation almost instantly. And when it transferred to the West E…