Mesolithic Human Occupation and Seasonality: Sclerochronology, Δ 18 O Isotope Geochemistry, and Diagenesis Verification by Raman and La-Icp-Ms Analysis of Argyrosomus Regius (Meagre) Sagittae Otoliths from Layer 1 of Cabeço da Amoreira Mesolithic Shell Midden (Muge, Portugal)