Execute complaint actions using actual quantity of sale lines
Since 6cbeb76e5c32 we have the actual quantity of a sale line. When executing an action of a complaint based on a sale or a sale line, user may expect that only the actual quantity is used if there is no specific quantity defined. For example the sale line may have being partially shipped (and the remaining ignored) so the company does not want to refund or return the initial quantity but only the actual quantity. Idem for partial invoicing etc.