Commentary He’s baaaack and on a TV screen near you! Dexter, that wacky and seemingly affable character who loyal viewers were led to believe had died in a hurricane 10 years ago is, in fact, alive and well and once again up to no good. Executives at the cable service Showtime never forgot the record-breaking ratings Dexter brought to their bottom line, so they have resurrected this serial killer who preys on serial killers who have avoided prosecution. The new series, entitled “Dexter: New Blood,” reveals the main character (portrayed again by actor Michael C. Hall) is alive and well. He has adopted a new name, Jim Lindsay, is living a quiet life in tiny Iron Lake, New York, and, oh yeah, his girlfriend just happens to be the chief of police. He talks to his dead sister, who congratulates Dexter on his ability to keep his homicidal side in …