International organization — European Coal and Steel Community — Appeal against inaction of High Authority under Article 35 of E.C.S.C. Treaty — Circumstances in which High Authority deemed to have taken decision refusing to act — Liability of High Authority for faute de service — Whether liable for lack of supervision of subordinate organs connected with subsidy system for scrap — Whether enterprises can rely on past practice of such organs in making transport payments — Effect of promises by such organs — Measure of damages for loss caused by faute de service.