Add offline option for the run function

AMAPVox::run function checks whether there is internet access with a ping at forge.ird.fr.

In some cases you may have a successful ping but the curl request to the Gitlab API for the versions may fail and it prevents from using the package because the getRemoteVersion is not fail-safe.

For a quick fix I suggest to add an offline=false option in the AMAPVox::run function and AMAPVox::versionManager function that would force to run local version and skip the remote check