Humans have been conducting war, commerce, and exploration on the world’s oceans for thousands of years, and the oceans have been reflected in human literature from its beginnings. Histories of that relationship abound, including Lincoln Paine’s “The Sea and Civilization,” James Stavridis’ “Sea Power,” and Samuel Eliot Morison’s “The European Discovery of America.” Now comes David Abulafia’s  “The Boundless Sea: A Human History of the Oceans,” which focuses