title: Read a text file with variable number of columns to a list
body: <p>I have a file like this:</p>
  
  <pre><code>mylist.txt
  234984  10354  41175 932711 426928
  1693237   13462
  </code></pre>
  
  <p>Each line of this file has different number of elements, minimum of 1 element per line.
  I would like to read it into a list like this:</p>
  
  <pre><code>&gt; print(head(mylist,2))
  [[1]]
  [1] 234984  10354  41175 932711 426928
  
  [[2]]
  [1] 1693237   13462
  </code></pre>