Oliver Hahn, Claudia Colini, Ira Rabin: X-Ray Fluorescence, Reflectography, Visible Spectrophotometry, Fourier-transform Infrared Spectroscopy, and Microscopy Data of Inks and Pigments from Timbuktu, Mali, Mamma Haidara Commemorative Library MS.Haidara.n.1, n.2, n.3, n.4, n.5, n.6, n.7 and n.8. UHH-FDR 2021