Stone came into my garden last year. And I have to say it lifted my spirits considerably. There is nothing like a stone wall that you didn’t have to build yourself. In her new book The Spirit of Stone (St. Lynn’s Press $21.95)Jan Johnsen shows us the many ways that many types of stone can be used in the garden, from practical porous driveway paving to rustic or elegant stone walls, walkway paving, dry gardens, as sculpture and…