title: List files in sub-directories with QDir's filter
body: <p>I'm looking for a function similar to the python glob function.</p>
  
  <pre><code>If my folder structure is:
  folder1/abc1.txt
  folder1/xyz1.txt
  folder1/abc2.txt
  folder2/abc3.txt
  folder2/xyz4.txt
  folder3/abc5.txt
  </code></pre>
  
  <p>then if I give <code>*/abc*</code>, I'm looking for an output of:</p>
  
  <pre><code>folder1/abc1.txt
  folder1/abc2.txt
  folder2/abc3.txt
  folder3/abc5.txt
  </code></pre>
  
  <p>I tried entrylist, but it just lets me filter on what's in the current folder.</p>