 By Dan Williams JERUSALEM Reuters - Israels president warned on Sunday that the country faced an historic constitutional crisis over a contested judicial reform plan, and said he was mediating between the relevant parties. Prime Minister Benjamin Netanyahu, now in his sixth term, wants to rein in the Supreme Court, which members of his religious-nationalist coalition accuse of overreach and elitism. Opponents of the plan, who held nationwide protests on Saturday, say it would cripple judici... 