string create_wizard(name)
string name;

Create the environment and castle for a wizard. Do NOT use this if you
are not sure about what you are doing !
It will create a new directory for wizard with the name "name", and
copy a definition of a castle to this directory. It will also
set up automatic loading of this castle for the start of the game.

It returns the name of the new castle. In case of error, false is returned.
