Hey kid, wanna buy a ZIL? The limo used by Gorby and Yeltsin, a vehicle straddling the greatest divide in geopolitical power seen in the non-wartime 20th Century, is up for grabs at Sotheby's first-ever auction in Russia. Also on the block? How 'bout Leonid Brezhnev's specially-constructed Nissan limo? Unfortnately,…