CAIRO (Reuters) - Several hundred Egyptians protested in central Cairo on Monday in the largest street demonstration since the launch last year of a campaign against continued rule by the Mubarak family. Liberals, leftists and Islamists chanted: "Enough, shame, have mercy" and "Down, down with (President) Hosni Mubarak" in a public square outside the gates of Cairo University, as tens of thousands of mostly bemused commuters drove past. Many of them carried yellow flags or stickers saying "Enough" -- the slogan of an informal movement dedicated to stopping Mubarak from obtaining a fifth six-year term in office or arranging for...