Removed unavailable boxes

Ubuntu Oneiric 64, cause GitHub does not allow download of big blobs.

Not Found boxes (HTTP/1.1 404 Not Found):

    * Archlinux 2011.08.19 - 64: this box redirects to
    * http://sourceforge.net;
    * Debian Lenny 32 puppet;
    * Debian Lenny 32;
    * Debian Wheezy amd64 minimal (base install  ... just an install');
    * Fedora 18 x86_64 Minimal (with Puppet, VirtualBox 4.2.6 and rpmfusion);
    * OpenBSD 5.0 (i386);
    * OpenSUSE 12.1 64 puppet (until 2012-12-17): the message __"The
      application/octet-stream file vagrant-opensuse-121-64.box (524
      379 648 bytes) uploaded onto the Inria exchange server by
      Remy.Garrigue@inria.fr on 17-07-2012 at 17:34 for five months
      has reached its time limit, and has been removed)"__ is displayed
      instead the box content.