Lfun:	query_weight - get the weight of an object

Synopsis:
	int query_weight()

Description:
	The query_weight call gets the weight from an object. It is auto-
	matically called by the transfer efun.

	Classification:
		 0  - (almost) no weight
		 1  - light
		 2  - normal
		3-5 - heavy
		6-9 - very heavy

	Living objects have weight 6. Note that objects only have a weight,
	no size.

Return value:
	An integer stating the weigth of the object.

Examples:
	query_weight() { return 2; }

See also: object/query_value, object/add_weight, efun/transfer