Lfun:	prevent_insert - prevent insert into container

Synopsis:
	int prevent_insert()

Description:
        Define this function in an object that is neither living nor room
	if you want to prevent this object to be put into a container, e.g.
        a bag or chest.

Return value:
        Return true if not ok, otherwise 0. That means that default is
        that it is possible to put something into an object.

Note:
	Might become deprecated!

See also: efun/transfer, object/can_put_and_get, object/notify_item_enter, object/notify_item_leave, object/forbid_item_enter, object/forbid_item_leave, object/notify_enter_container, object/notify_leave_container, object/forbid_enter_container, object/forbid_leave_container