Downton's dearly departed

With "Downton Abbey" coming to an end Sunday after six extremely entertaining, occasionally absurd and frequently moving seasons, we look at the many, many characters, both human and otherwise, who've gone gently into that good night since the series began with the sinking of the British passenger liner Titanic in 1912. Cue the Sarah McLachlan, bust out the tissue and take a trip down memory lane with us. …