SEASON PREMIERE: This is both an old and a new season of The Great British Baking Show on PBS, which is confusing but wonderful news. And now, an explanation: In England, when this delightful, oddly soothing baking competition show premiered on the BBC, it was televised under the title The Great British Bake Off, with its secret weapon being effusive and oh-so-British judge Mary Berry. After a handful of seasons, the increasingly popular series transferred to Britain’s Channel 4, dumping t