Use logging in ProductOpener::Display
Use logging in ProductOpener::Display

- search_and_map_products
- search_and_graph_products
- display_histogram
- display_scatter_plot

openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server