title: SEd: replace whitespace characters with single comma except inside quotes
body: <p>This line is from a car dataset (<a href="https://archive.ics.uci.edu/ml/datasets/Auto+MPG" rel="nofollow">https://archive.ics.uci.edu/ml/datasets/Auto+MPG</a>)
  looking like this:</p>
  
  <pre><code>15.0   8.   429.0      198.0      4341.      10.0   70.  1.     "ford galaxie 500"
  </code></pre>
  
  <p>how would one replace the multiple whitespace (it has both space and tabs) w/ a single comma, but not inside the quotes, preferably using sed,to turn the dataset into a REAL csv. Thanks!</p>