If you had the good fortune of experiencing the intimate Off-Broadway production of Days of Wine and Roses a few months back, anchored by the exquisite lead performances by Kelli O'Hara and Brian d'Arcy James, might I suggest a visit to the musical's new home at Studio 54 on Broadway? Because what seemed at the time to be a brilliant song cycle hobbled by a sketchy book has fully blossomed there, where, alas, it is o…