Theater review LIBERATION Two hours and 30 minutes, with one intermission. At the James Earl Jones Theatre. Progress ain’t easy, preaches the new Broadway play “Liberation,” which opened Tuesday night at the James Earl Jones Theatre. That bittersweet message is a common one onstage. How many issue-based shows have you seen that wrap up with, “And, from then on, the world was perfect”? Messiness and dissatisfaction abound, here too, and that’s kind of the point.  But along with the “one step