title: how to remove vertex , edge or face from CGAL::Linear_cell_complex_for_combinatorial_map
body: <p>I'm creating an application using qt creator which read .off files as CGAL::Linear_cell_complex_for_combinatorial_map and preview it 
  I want to make operations on the read mesh such as removing vertix,edge or face and restore it .</p>
  
  <p>I created a loop to access darts :
  Dart_handle dh;</p>
  
  <pre><code>for (LCC_3::Dart_range::iterator it=lcc.darts().begin(),
             itend=lcc.darts().end(); it!=itend; )
      {
        dh=it++;
        if ( it!=itend &amp;&amp; it==lcc.beta&lt;2&gt;(dh) ) ++it;
  
  }
  </code></pre>
  
  <p>any help or usefull links to simplify mesh or removing vertices , edges or faces ?
  I appreciate any help</p>