The six-part “A Course Called Ireland,” in which Bill Murray and author Tom Coyne golf their way around the Ould Sod, is a joy, with missed putts. Viewers will certainly laugh, many times. But they’ll also smile, from the first hole to the last pub. We are informed quite often about what the show is not, initially by Margaret, a delightful little white-haired lady who talks us through the first episode. (Each is narrated by a different local person.) It’s not about Bill Murray. (It is.) It’s not about golf. (It is.) Without a doubt, it is one of the…