[F] Add datetime of last sync in cover
[B] Fix use of lock tocken in sync
[B] Fix for utf-16 note
[B] Remove some utf-8 debug printing that could raise exception if stdout isnt in utf-8
[F] Some PEP8 cleaning
[F] Raise a error in case of IO Error when reading a note
[F] Add optionnal log for sync
[F] Store password encrypted