SERIES PREMIERE: As television history goes, this is fascinating. Norman Lear, the TV producer whose politically volatile, topic-heavy sitcoms such as All in the Family dominated and altered TV in the 1970s, is still at it at age 94, and has worked with other TV writers and producers to update one of his Seventies comedy hits, One Day At a Time, for a 21st-century audience. It’s still an old-fashioned, Lear-like sitcom, with the same central theme: a divorced mom raising kids and having an