LONDON (Reuters) – The London Metal Exchange (LME) should keep nickel trading suspended until price stability can be guaranteed, the European Steel Association (Eurofer) said on Wednesday, a day after nickel prices doubled in a matter of hours. The LME and Britain’s financial watchdog, the Financial Conduct Authority, should take necessary action to “resolve the massive, artificial fluctuations in nickel prices,” the industry group said in a statement. The LME was forced to halt nickel trading and cancel trades after prices soared on Tuesday to more than $100,000 per tonne in a surge that sour…