It is now possible to see the list of all contacts contained in a akonadi collection.
The number of the collection is defined in Contacts.cpp.

It is possible to remove one contact from the list with user confirmation.
Now, the model is not connected directly with the view.
Manually, the view asks the controler to delete a contact.
The controler is in charge to modify model and to ask the view to refresh itself.
This last point has to be improve.