title: Escaping special characters in to_tsquery
body: <p>How do you espace special characters in string passed to <code>to_tsquery</code>? For instance, this kind of query:</p>
  
  <pre><code>select to_tsquery('AT&amp;T');
  </code></pre>
  
  <p>Produces:</p>
  
  <pre><code>NOTICE:  text-search query contains only stop words or doesn't contain lexemes, ignored
  
   to_tsquery 
  ------------
  
  (1 row)
  </code></pre>
  
  <p>Edit: I also noticed that there is the same issue in <code>to_tsvector</code>.</p>