Add default metaset type names as constants.
Add notification metaset type to constants.
Workflow errors in transitions will now be logged to the tasks's metaset and the task will be set to a 'failed' procstate.
Cinnamon 2.5.0: refactored IndexServer, added IndexJob

The new IndexServer will index a class based on index job objects and no longer changes the indexed objects. The advantage is two-fold:
1. Eliminate race-condition between IndexServer and other processes trying to update an object.
2. In case of a server crash (or database rollback), the Lucene index will not contain objects that do not exist in the database.