title: dec argument in data.table::fread
body: <p>I am using <code>fread</code> from <code>data.table</code> to load csv files. However my csv files uses <code>dec=","</code> as a decimal-separator (<code>1.23</code> will be <code>1,23</code>). Unlike in <code>read.csv</code> it seems that <code>dec</code> is not an allowed parameter.</p>
  
  <pre><code>R) args(fread)
  function (input = "test.csv", sep = "auto", sep2 = "auto", nrows = -1,
      header = "auto", na.strings = "NA", stringsAsFactors = FALSE,
      verbose = FALSE, autostart = 30)
  </code></pre>
  
  <p>Do you see a work around (a R option to set may be) that will enable me to use <code>fread</code> (it is so much faster that it saves me a lot of time)? </p>
  
  <p>PS: <code>colClasses</code> is not yet implemented so <code>setAs</code> cannot be used like in <a href="https://stackoverflow.com/questions/5068705/processing-negative-number-in-accounting-format/5069649#5069649">this post</a></p>