title: Exceptions in Lablgtk callbacks
body: <p>In Lablgtk, whenever there is an exception in a callback, the exception is automatically caught and an error message is printed in the console, such as:</p>
  
  <pre><code>(prog:12345) LablGTK-CRITICAL **: gtk_tree_model_foreach_func: 
      callback raised an exception
  </code></pre>
  
  <p>This gives no stack trace and no details about the exception, and because it is caught I cannot retrieve this information myself.</p>
  
  <p>Can I enable more detailed logging information for this case? Or prevent the exception from being caught automatically?</p>