Database upload breaks if the file already exists at destination
Created by: pkorshunov
if the file for database 'dbname' already exists at /idiap/group/torch5spro/databases/latest, the command: bob_dbmanage.py dbname upload will break with an error 'Operation not permitted'. Once the database file is manually deleted from the destination, the command 'bob_dbmanage.py dbname upload' will work correctly.