workflows: Holding Pen improvement
- Removes selection of row on link click.
- Changes the way of update data in approval widget.
- Changes the way of handling widget in pages.
- Changes the way of managing tags.
- Adds retro-compatibility for _widget field in extra_data.
- Simplifies the handling of informations in the HTTP request.
- Adds new way to extract data from Workflow object.
Signed-off-by: Guillaume Lastecoueres <guillaume.lastecoueres@cern.ch>
Reviewed-by: Jan Aage Lavik <jan.age.lavik@cern.ch>