Datasets on bulk density and coarse fragment content from the French soil quality monitoring network oleh Jose-Luis Munera-Echeverri, Line Boulonne, Nicolas P.A. Saby, Dominique Arrouays, Benoît Bertouy, Eva Lacarce, Floriane Serré, Benoit Toutain, Florent Millet, Thomas Loiseau, Manuel Martin