Aliens — Refugees — Determination of refugee status — Procedure — Person given temporary residence permit — Subsequently claiming refugee status in hope of being granted permanent residence — Minister rejecting claim — Whether required to give reasons — Whether entitlement to refugee status to be determined by reference to applicant’s circumstances at time of arrival in Australia or at time of making claim — Geneva Convention Relating to the Status of Refugees, 1951, and Protocol, 1967 — The law of Australia