Lfun:	query_value - get the value of an object

Synopsis:
	int query_value()

Description:
	The query_value call gets the value from an object. Living objects
	don't have any value (and cannot be sold therefore). Items with a
	value of more than 2000 will be destructed when they are sold.

Return value:
	The value of the object in gold coins using the old currency system,
	else the value in copper coins.

Examples:
	query_value() { return 8; }

See also: object/query_weight