title: pandas sort column by correlation to first column
body: <p>I have a df</p>
  
  <pre><code>          A         B         C         D
  A  1.000000  0.202557  0.689214  -.705000
  B  0.202557  1.000000  0.038306 -0.113245
  C  0.689214  0.038306  1.000000  0.074773
  D  -.705000 -0.113245  0.074773  1.000000
  </code></pre>
  
  <p>I want to sort by correlation to column A,
  should sort by positive to negative</p>
  
  <pre><code>          A         C        B         D
  A  1.000000  0.689214  0.202557 -.705000
  </code></pre>
  
  <p>how can I do this?
  Thanks</p>