FOREX-Swedish crown slides after Riksbank surprises with cut to zero

* Swedish crown hits four-year low versus dollar LONDON, Oct 28 (Reuters) - The Swedish crown slid to a four-year low against the dollar and a four-month trough against the euro on Tuesday after Sweden's central bank surprised investors by slashing interest rates to a record low of zero percent. Most analysts had forecast the Riksbank to lower its main interest rate, the repo rate, to 0.1 ...