International organizations — International administrative tribunals — World Bank Administrative Tribunal — Investigation — Misconduct — Abuse of position for financial gain — Acceptance of remuneration from outside parties in connection with Bank appointment — Failure to observe generally applicable norms of prudent professional conduct — Performance of service for outside entity — Retention and sharing of pornography — Application of amended staff rules — Proportionality of sanction — Due process — Administrative leave during investigation — Removal from office premises