Collective.mustread

------------------

- Indicate end of database initialization in logs [thet]
- Support Plone 5.2 and Python2.7, Python 3.6 and Python 3.7 [ale-rt, thet]

------------------

- Do not break on the upgrade step that adds columns to the mustread table
[ale-rt]

------------------

- Added the possibility to specify engine parameters through the registry
[ale-rt]

- remove unneeded columns in ORM model (site_name, title, info) [fRiSi]

- Implemented API for scheduling items as must-read for certain users.
(see collective.contentrules.mustread for usage)

This required new database columns. The provided upgrade step works for sqlite databases
but might need changes for mysql or postgres. [fRiSi]

- Allow to create and configure a database file by using the `init-mustread-db` view
[fRiSI]

------------------

- Provide verbose error logging when database is not accessible [gyst]

- Trivial testing change [gyst]

----------------

- Initial release.
[gyst]