New features:
- Moved the option to keep documents checked out to the access permissions table.
- Moved the only remaining setting to the Post settings page (admin/content/node).
- Users with the 'administer checked out documents' permission are now given the option to immediately check-in a locked document through a link in the error message.
- Added support for PostgreSQL.
Bugs fixed:
- Stopped cron from spamming watchdog when there actually were no documents checked out.