By Dan Williams JERUSALEM (Reuters) -Israel gave its preliminary nod on Sunday to a draft U.S.-brokered deal demarcating a maritime border with Lebanon that may lead to profit-sharing in a disputed Mediterranean gas prospect. Hoping to defuse one source of conflict between the hostile countries and prod them toward accommodation, U.S. envoy Amos Hochstein last week submitted a new proposal that would pave the way for offshore energy exploration. After years of stop-start shuttle diplomacy, agreement seems closer than ever. As Beirut mulls the 10-page draft – details of which have been kept und…