Joined Cases T-60/06 RENV II and T-62/06 RENV II: Judgment of the General Court of 22 April 2016 — Italy and Eurallumina v Commission (State aid — Directive 92/81/EEC — Excise duties on mineral oils — Mineral oils used as fuel for alumina production — Exemption from excise — Selective nature of the measure — Aid which may be considered compatible with the common market — Community guidelines on State aid for environmental protection — Guidelines on national regional aid 1998 — Legitimate expectations — Legal certainty — Principle lex specialis derogat legi generali — Principles of presumption of legality and of the effet utile of acts of the institutions — Principle of sound administration — Obligation to state reasons)