JERUSALEM/BEIRUT (Reuters) – Lebanon and Israel are closer than ever to signing a deal demarcating their maritime border, opening the door to new oil and gas exploration, after years of U.S.-brokered negotiations. While limited in scope, the agreement is set to ease security and economic concerns in both countries, whose shared history is rife with hostility. The deal will only resolve a territorial dispute in the eastern tip of the Mediterranean sea and does not touch on their land borders, which are yet to be settled. Here are some details of the U.S. proposal that is being discussed on Thur…