title: R web-scraping remove unnecessary lines
body: <p>I am trying to webscrape a table which is intermittently interrupted by a repeat of the title header:
  date    LME Tin Cash-Settlement LME Tin 3-month LME Tin stock</p>
  
  <p>I can generate a list containing the data</p>
  
  <pre><code>library(XML)
  tableSN &lt;-readHTMLTable("http://www.westmetall.com/en/markdaten.php?     action=show_table&amp;field=LME_Sn_cash",stringsAsFactors = FALSE)
  tableSN
  
  
  class(tableSN)
  </code></pre>
  
  <p>But how can I get rid of the repeating title header to generate a clean datatable showing just the dates and the number columns</p>
  
  <p>How can I convert the numbers (eg 21.720,00  to 21,720.00) and the date (eg 30. December 2013 to 30-12-2013)</p>