Add some code in order the code of the setup to be able to be more reactive to the Cancel operation.  Now the user does not have to wait until the end of the download to stop the setup process nor to the end of the replication initialization.

However there is one thing that is missing: currently there is no mechanism to stop the offline import that we propose.  The code has been modified in order to have a placeholder to implement the code once that the stop of the offline import is allowed.