Be-caped and beguiling, Ryan Adams stages a triumphant solo return at the Barbican. Being a Ryan Adams fan can be a bit of a rollercoaster. There’s his habit of releasing everything he records, often for free, simply because he feels like it. For the record, I love it, but it drives some people nuts, and just confuses others. If mellow country classic Heartbreaker is your all-time favourite album…