*Risk appetite bigger at top Wall Street banks. LONDON, May 22- Europe's energy price manipulation probe has turned regulatory attention to secretive trading units at oil companies with huge turnover and millionaire staff with risk appetite higher than at Wall Street's biggest banks.
May 12- Tony Stark's superpowers lifted blockbuster "Iron Man 3" back to the top of movie charts in the United States and Canada, beating out a strong debut over the weekend for lavish Jazz Age drama "The Great Gatsby."
By Timothy Heritage and Maria Tsvetkova. MOSCOW, May 7- Russian media magnate Alexander Lebedev said as he went on trial on Tuesday that he expected to be jailed over a televised punch-up which he says is a pretext to punish him for criticising the Kremlin.