title: Reading aligned column data with fread
body: <p>I came across a file like this:</p>
  
  <pre><code>COL1        COL2          COL3
  weqw        asrg          qerhqetjw
  weweg       ethweth       rqerhwrtjw
  rhqerhqerhq qergqer       qerhqew5h
  qerh        qergqer       wetjwryerj
  </code></pre>
  
  <p>I could not load it directly with <code>fread</code> so I replaced <code>\s+</code> by <code>,</code> with <code>sed</code> than I gave to fread and it solved it. But is there a built in way of reading this kind of data with <code>data.table</code> ?</p>