Spanish Premier Resigns, Apparently at King's Wish
Spanish Prime Min Carlos Arias Navarro and Spanish Cabinet unexpectedly resigns; development, apparently result of King Juan Carlos's decision, throws program for dem change into state of confusion; Juan Carlos reptdly has been unhappy with Arias Navarro's cautious approach; Govt will remain in office in caretaker capacity under 1st Deputy Prime Min Fernando de Santiago; King has 10 days to name new Govt head from list proposed by Realm Council; proposed names include Army chief of staff Lt Gen Jose Vega Rodriguez; Arias Navarro por (M)