//!< adds a new link prior to the position specified in "where".
/*!< thus a "where" value of less than or equal to zero will add a new
link as the first element. a "where" value greater than or equal to
//!< adds a new link prior to the position specified in "where".
/*!< thus a "where" value of less than or equal to zero will add a new
link as the first element. a "where" value greater than or equal to