[crossfire] New bot flag

[Nicolas Weeger (Laposte)]

Hello.

I just added a bot flag, for players.

To activate it, a client just has to send "bot 1" (or anything atoi will 
recognize as non zero) through the "setup" command.

When activated, this flag will make the player have a proeminent "[BOT]" in 
"who" output, and more important this player will not be counted in 
statistics sent to metaserver.

This lets us send only relevant information to metaserver, real players :)

Nicolas