title: merging several hdf5 files into one pytable
body: <p>I have several <code>hdf5</code> files, each of them with the same structure. I'd like to create one <code>pytable</code> out of them by somehow merging the <code>hdf5</code> files.</p>
  
  <p>What I mean is that if an array in file1 has size x and array in file2 has size y, the resulting array in the <code>pytable</code> will be of size x+y, containing first all the entries from file1 and then all the entries from file2.</p>