RIYADH (Reuters) - France is ready to listen to the U.S. administration's proposal of offering U.S. companies a "safe harbour" from a new, international digital tax, its finance minister said on Saturday, while admitting that he still didn't know what that meant in practice."I'm not in a position to tell you what it (a safe harbour) really means," Le Maire told journalists on the sidelines of a G20 summit in Saudi Arabia. "(But) it's fair and useful to give all the attention to this new..