PARIS (Reuters) - French inflation eased to its lowest level in four years in May as a drop in energy prices accelerated, according to a preliminary reading from the INSEE statistics agency on Thursday.EU-harmonised data showed that consumer prices were unchanged from April, which meant that 12-month inflation slipped to 0.2% from 0.4% the previous month, hitting the lowest level since May 2016.In sync with a slump in global crude oil prices, energy prices fell 11.0% in May over 12 months after..