Q2 : Updated "checkers" to "checkers (draughts)" for Chellapilla and Fogel's work.
Q4.1 : Noted that FTP address for Larry Yaegers Polyworld is now unknown (does anyone know
where it has gone to?)
Q12 : Updated conference information
Q15.3 : Deleted reference to Purdue site, since it has now gone
Q20.1 : Revised entry for Gannet.
Q99 : Elitism - fixed typo