- Update to the new upstream version 2.1.0.53:
* Added: proxy authentication handling
* Added: backups can be created inside synchronization
* Added: synchronization can be disabled
* Fixed: backup upload could be interrupted by network errors
* Fixed: error 400 when a backup was deleted and the recreated
with same name
* Fixed: crash when actions on backup were attempted during pause
* Fixed: the 'kept_versions' switch on backup creation was not
handled
* Fixed: other minor bugs
* Changed: extra arguments now generates an error (they were
silently ignored before)
* Changed: the libgdiplus library is no longer required to run
the program