AzTEC Half Square Degree Survey of the SHADES Fields -- I. Maps, Catalogues, and Source Counts by Austermann, J, Dunlop, J, Perera, T, Scott, K, Wilson, G, Aretxaga, I, Hughes, D, Almaini, O, Chapin, E, Chapman, S, Cirasuolo, M, Clements, D, Coppin, K, Dunne, L, Dye, S, Eales, SA, Egami, E, Farrah, D, Ferrusca, D, Flynn, S, Haig, D, Halpern, M, Ibar, E, Ivison, R, Kampen, E