Two more indispensable modern Doctor Who episodes are shown tonight, accompanied by behind-the-scenes info. The first is The Day of the Doctor, the show’s golden anniversary special. (Yes, Golden. Doctor Who premiered on the BBC the same week in 1963 as the JFK assassination.) Then, at 10 p.m. ET, comes The Name of the Doctor, a Matt Smith episode featuring the dangerous Whisper Men. The new season of Doctor Who begins in just a few weeks, and these episodes, and extras, serve as tantalizi