News roundup: China’s economic growth slides to 25-year low in 2015 … IEA says global oil market could ‘drown in oversupply’ … Scars of last year’s tax season means everyone will be on alert

Eastern headwinds: China's economy cooled further in the latest quarter, dragging 2015's full-year growth to a quarter-century low and deepening a slowdown that has fueled anxiety over its impact on t…