Publicis Groupe is predicting a better fourth quarter - both for itself and for the overall ad market - and a return to growth in the second half of 2010.The French advertising conglomerate reported that sales were down 5.3% in Q309 compared with the same quarter in 2008, while organic revenues declined by 7.4%, compared with analyst predictions of a 6.9% drop, MediaBuyerPlanner writes. The 7.4% drop was an improvement over the 8.6% decline in Q2.Publicis said it will reach its target of having