def commentsrel
     unless Dir[@destination + '/xl/worksheets/_rels'].empty?
      Find.find(@destination + '/xl/worksheets/_rels') do |path|
        if File.basename(path).split(".").last=='rels'
          a=IO.read(path)
          f=Ox::load(a)
          f.locate("Relationships/*").each do |x|
            if x[:Target].include?"comments"
              @sheets.each do |s|
                if "worksheets/" + File.basename(path,".rels")==s[:filename]
                  s[:comments]=x[:Target]
                end
              end
            end
          end
        end
      end
     else
       @sheets.each do |s|
         s[:comments]=nil
       end
     end
    end
def commentsrel
     unless Dir[@destination + '/xl/worksheets/_rels'].empty?
      Find.find(@destination + '/xl/worksheets/_rels') do |path|
        if File.basename(path).split(".").last=='rels'
          a=IO.read(path)
          f=Ox::load(a)
          f.locate("Relationships/*").each do |x|
            if x[:Target].include?"comments"
              @sheets.each do |s|
                if "worksheets/" + File.basename(path,".rels")==s[:filename]
                  s[:comments]=x[:Target]
                end
              end
            end
          end
        end
      end
     else
       @sheets.each do |s|
         s[:comments]=nil
       end
     end
    end
Build the relationship between sheets and the XML files storing the comments
 to the actual sheet.