In normal tree view duplicate and archive can be done throught the
action menu. So we only need to show this button when this tree view
are included in a form using a o2m or m2m.
So this visibility can be activated by passing value in the context
Also make the copy consitent whatever way you do it
- correct `directory_output` value
- mute logger for desired raise exception
- change how the "already imported files" are checked when
"check_duplicated_files = True" :
It occurs that a task o2m field `attachment_ids` returns an empty record
when checked during the `_file_to_import()` method... but only when
the module `autovacuum_message_attachment` is installed !
Sébastien BEAU
clementmbr
David Beal
Florian da Costa
Giovanni