title: Reset a column's MultiIndex levels
body: <p>Is there a shorter way of dropping a column MultiIndex level (in my case, <code>basic_amt</code>) except transposing it twice?</p>
  
  <pre><code>In [704]: test
  Out[704]: 
             basic_amt               
  Faculty          NSW  QLD  VIC  All
  All                1    1    2    4
  Full Time          0    1    0    1
  Part Time          1    0    2    3
  
  In [705]: test.reset_index(level=0, drop=True)
  Out[705]: 
           basic_amt               
  Faculty        NSW  QLD  VIC  All
  0                1    1    2    4
  1                0    1    0    1
  2                1    0    2    3
  
  In [711]: test.transpose().reset_index(level=0, drop=True).transpose()
  Out[711]: 
  Faculty    NSW  QLD  VIC  All
  All          1    1    2    4
  Full Time    0    1    0    1
  Part Time    1    0    2    3
  </code></pre>