notifications 6.x-2.0-beta5

Fixed some issues with notifications lite, templates and digesting and some others:
Moved some modules to a different package, http://drupal.org/project/notifications_extra
- Fixed: notification subscription error in postgreSQL, #442852
- Fixed: notifications lite messages were not digested properly
- Renamed template parts for group footer: 'footer' => 'closing' to avoid overlap
- Fixed: Event for token replacement was not properly set in short digests
- Fixed: notifications_process_rows() not returning the right number of rows in queue
- Added some tests a base test clase, some utility function, etc...
- Improved queue status report and new clean option, #441342
- Added event information to objects for token replacement in digests, #348722
- Fixed multiple minor usability and formatting issues in subscriptions form
- Renamed custom subscriptions field names: explanation -> description.