MINISERIES PREMIERE: This three-part, three-hour miniseries, based on the novel by Harry Potter author J.K. Rowling, is presented over two nights by HBO, with the first two hours tonight and the concluding hour tomorrow night. It’s about a fictional small town in England, called Pagford, awash in some particularly nasty local politics. A charitable halfway house for low-income families and recovering addicts, housed in a stately old donated building, is one council vote away from being rep