def table= table, options={}
      if table.is_a? Workbook::Table
        self[0] = table
      else
        self[0] = Workbook::Table.new(table, self, options)
      end
      return table
    end
def table= table, options={}
      if table.is_a? Workbook::Table
        self[0] = table
      else
        self[0] = Workbook::Table.new(table, self, options)
      end
      return table
    end
Set the first table of this sheet with a table or array of cells/values
 @param [Workbook::Table, Array<Array>] table   The new first table of this sheet
 @param [Hash] options                          are forwarded to Workbook::Table.new
 @return [Workbook::Table] the first table of this sheet