[examples] "pictures" fixes

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
[vault] accept "synonyms"

export/backup, import/restore

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
generic status checks to vault/status

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
[vault] using dir tree based configuration

initially configuration was stored in a single file, later it was
separated to single file for each unit for global configuration to
support independent un/registration on installation, now also vault
configuration is modified to use the same functionality

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
global and vault unit config

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
pictures example is updated

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
snapshot reports note for the name

previously it was treeish but the most common scenario is that note is
requested by snapshot name returned by list()

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>
[vault] api and configuration storage format changes

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jollamobile.com>