France after Charlie: Paris still on tenterhooks (part 2)

When two brothers stormed the headquarters of satirical weekly Charlie Hebdo, killing some of France's best known cartoonists, along with staff and police, it triggered a 72-hour manhunt and a separate siege at a kosher supermarket in the French capital. How different is France one year on? We draw the parallels and distinctions with the November Paris attacks, and see what lessons have been learned about the attackers and their motives.