title: unoconv fails to save in my specified directory
body: <p>I am using unoconv to convert an ods spreadsheet to a <code>csv file</code>.  </p>
  
  <p>Here is the command:</p>
  
  <pre><code>unoconv -vvv --doctype=spreadsheet --format=csv --output= ~/Dropbox 
  /mariners_site/textFiles/expenses.csv ~/Dropbox/Aldeburgh/expenses
  /expenses.ods
  </code></pre>
  
  <p>It saves the output file in the same directory as the source file, not in the specified directory.  The error message is:</p>
  
  <pre><code>Output file: /home/richard/Dropbox/mariners_site/textFiles/expenses.csv
  unoconv: UnoException during export phase:
  Unable to store document to file:///home/richard/Dropbox/mariners_site
  /textFiles/expenses.csv (ErrCode 19468)
  </code></pre>
  
  <p>I'm sure that this worked initially, but it has since stopped.  </p>
  
  <p>I have checked for permissions and they are identical for both directories.</p>