Commission Delegated Regulation (EU) supplementing Regulation (EU) No 1308/2013 of the European Parliament and of the Council with regard to import licence applications, release for free circulation and proof of refining of sugar products of CN code 1701 under preferential agreements, for the marketing years 2015/2016 and 2016/2017 and amending Commission Regulations (EC) No 376/2008 and (EC) No 891/2009