[imp] Namespace in imp 5.0

[Yoseff Francus]

In 4.0 I have a config section for my servers that sets the mail folders 
that are shown to be those in the directory mail/

How do I set this up in 5.0?

'imap_config' => array(
             'children' => false,
             'namespace' => array(
                 'mail/' => array(
                         'name' => 'mail/',
                         'delimiter' => '/',
                         'type' => 'personal',
                         'hidden' => false,
                     ),
             ),
             'search_charset' => array(
                 'UTF-8' => true
         )
      )