==================
Features
--------
- Added data migration subsystem. It is documented
in the "Data migration" chapter.
- Added data population subsystem. It is documented
in the "Data population" chapter.
- Added a ``ptah-migrate`` script. It is documented
in the "Command-Line utilities" chapter.
- Added a ``ptah-populate`` script. It is documented
in the "Command-Line utilities" chapter.
- Added a ``default_roles`` setting. It defines
list of roles for principal.
- Its possible to start ptah without database.
- Added json dict column ``ptah_nodes.annotations``.
- Removed `ptah_content` table columns,
`view`, `creators`, `subjects`, `publisher`, `contributors`.
Bug Fixes
---------
- MySQL Compatibility 116