#316868 by Crell: Make addField() alias to the field name, rather than the table and field name when there are no conflicts.

- Patch #302518 by AlexisWilke: fixed problem with PostgreSQL users not being able to delete blocks.

- Patch #302936 by Aron Novak, Crell et al: convert aggregator module to the new DB abstraction layer.

- Patch #304924 by Damien Tournoud: extend error handler to manage exceptions.  I have one exception and one fail.

- Patch #320374 by Damien Tournoud, pwolanin et al: worked around a max_allowed_packet size issue with the simpletests.