function formatValue(value, field){
  // (summarised code)
  // Given a value and a field definition, apply the appropriate formatting
  // Used in the Query Widget and Identify functions

    if (field.decimals !== undefined) {
      value = round(value, field.decimals);
    }
    if (field.date !== undefined && value !== null){
      ...
        var theDate = moment(new Date(value));
    }
    if (field.thousands !== undefined) {
      value = addThousandsSeparator(value);
    }
    if (field.prefix !== undefined){
      value = field.prefix + value;
    }

  return (value);
}