REPUBLIC v. AKUAKU II; EX PARTE CHAYI II Chieftaincy—Traditional Council—Membership—Mandatory administrative duty of summoning members to meetings and notifying regional house of chiefs about changes in membership devolving on president of traditional council—Whether mandamus available to compel performance of duty—Chieftaincy Act, 1971 (Act 370), ss. 13, 14 and 16.