Commission Regulation (EC) No 2078/95 of 30 August 1995 concerning derogations in the cereals sector from Regulation (EEC) No 3665/87 laying down common detailed rules for the application of the system of export refunds on agricultural products and from Regulation (EEC) No 3719/88 laying down common detailed rules for the application of the system of import and export licences and advance-fixing certificates for agricultural products