The flat line observed in Glanbia’s share price on Thursday doesn’t do justice to the half-year results presented by group managing director Siobhán Talbot in the morning. Granted, the market had already priced in an upswing in the company’s performance. It had announced in May that it was headed for the top bracket of a 6 to 12 per cent expected increase in earnings per share this year, and updated this guidance to between 17 and 22 per cent last month.  As expected, the first half of this year showed recovery from the slump observed during the same period in…