Re-implement mapping_t::get_map()
Re-implement mapping_t::get_map()

which is needed only by some debug prints.

gnb/novaprova,gnb/novaprova,novaprova/novaprova,gnb/novaprova,novaprova/novaprova,gnb/novaprova,greig-hamilton/novaprova,greig-hamilton/novaprova,greig-hamilton/novaprova,novaprova/novaprova,novaprova/novaprova,novaprova/novaprova,greig-hamilton/novaprova,greig-hamilton/novaprova,gnb/novaprova