new duplicity loses option --ssh-backend causing backups to fail

I noticed that duplicity backups started to fail because of:

Warning: Duplicity cleanup failed.
Warning: Duplicity remove-older-than failed.
Error: Usage:
Error: duplicity [full|incremental] [options] source_dir target_url
Error: duplicity [restore] [options] source_url target_dir
Error: duplicity verify [options] source_url target_dir
Error: duplicity collection-status [options] target_url
Error: duplicity list-current-files [options] target_url
Error: duplicity cleanup [options] target_url
Error: duplicity remove-older-than time [options] target_url
Error: duplicity remove-all-but-n-full count [options] target_url
Error: duplicity remove-all-inc-of-but-n-full count [options] target_url
Error: Backends and their URL formats:
Error: cf+http://container_name
Error: file:///some_dir
Error: ftp://user[:password]@other.host[:port]/some_dir
Error: ftps://user[:password]@other.host[:port]/some_dir
Error: hsi://user[:password]@other.host[:port]/some_dir
Error: imap://user[:password]@other.host[:port]/some_dir
Error: rsync://user[:password]@other.host[:port]::/module/some_dir
Error: rsync://user[:password]@other.host[:port]/relative_path
Error: rsync://user[:password]@other.host[:port]//absolute_path
Error: s3://other.host/bucket_name[/prefix]
Error: s3+http://bucket_name[/prefix]
Error: scp://user[:password]@other.host[:port]/some_dir
Error: ssh://user[:password]@other.host[:port]/some_dir
Error: swift://container_name
Error: tahoe://alias/directory
Error: webdav://user[:password]@other.host/some_dir
Error: webdavs://user[:password]@other.host/some_dir
Error: gdocs://user[:password]@other.host/some_dir
Error: mega://user[:password]@other.host/some_dir
Error: copy://user[:password]@other.host/some_dir
Error: dpbx:///some_dir
Error: onedrive://some_dir
Error: azure://container_name
Error: Commands:
Error: cleanup 
Error: collection-status 
Error: full  
Error: incr  
Error: list-current-files 
Error: restore  
Error: remove-older-than 

This is with duplicity 0.7.01-1

(from redmine: created on 2015-02-03)

Edited by Guillaume Subiron
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