serializer: make save icon a public function
Rename notes as first row is edited

See #688902
Do not perform any wrong magic here. When the first row is edited,
change the note name.
ownCloud: adapt to new auto-rename behaviour

ownCloud notes should delete old files and create new ones
as their title change. TODO : destroy old thumbnails.
ownCloud: better handle note creation with a primary path

generate a unique path at startup that will anyway be changed soon
ownCloud: do not create a file each time the note is renamed

We end up with a big mess. Rather wait some secs before
creating a new file.
shell: start fixing ownCloud notes research in shell