SYNOPSIS
	int set_is_wizard(object ob, int n)

DESCRIPTION
	Change object ob's wizardhood flag.
	If n is 0, it is cleared, if n is, it is set, if n is -1 the
	current status is reported. The return value is always the new
	value of the flag. Using this function sets a flag in the
	parser, that affects permissions for dumpallobj etc, which are
	by default free for every user.