Consuls — Privileges and Immunities of — Consul as Co — plaintiff in Civil Action — Duty to Deposit Cautio Judicatum Solvi — Consul as Resident in Receiving State — Execution of Order for Costs Against Foreign Consul — Declaration Made by Consul in Course of Legal Proceedings — Application of Principle Pacta Sunt Servanda — Consulate as Juridical Person — Proof of Status of Consulate — Whether Immunity Need be Pleaded — Certificate of Ministry for Foreign Affairs