- Separate grub-efi into a separate subpackage. This will allow us to install
  grub2 for new instalations without the need to obsolete grub in existent
  instalations. We want existent systems to keep using grub and make new 
  instalations with ALDOS 1.4.5 to use grub2. With this we may use grub-efi 
  with grub or grub2.
- Make grub to require grub-efi to avoid breaking existent systems.
- Make grub to conflict with grub2.
- Silence stdout and stderr in post and preun scripts.