anchor.diff:  
       type CommodityConfig = {
           Commodity: Commodity;
  -        GoogleFinanceKey: string;
  +        GoogleFinanceSearchSymbol: string;
       }
   
       type CommodityPrice = {
  
positive.code:             
  
      let getPricesForNewCommodity (usage: CommodityUsage) (config : CommodityConfig) =
          let baseURL = generateBaseURL config.GoogleFinanceKey usage.FirstAppeared usage.ZeroBalanceDate
          let prices = getPrices baseURL 0 usage.Commodity
          createCommodityPriceDB (usage.Commodity, prices)
          
  
negative.code:             [x] Fetch page and extract prices
              [x] Generate next URL
  
  *)
  
  module Main =
  