Some minor database changes for file tables. Namely:
* Added a timestamp to all tables
* Added a filename column for local files
* Change some tables that had unnecessary auto-increment primary
keys when they had another unique column that should act as
the primary key
* Change engine from MyISAM to InnoDB for a couple of files.
Also, rebuilt the DB_DataObject files for all these tables.
Evan Prodromou
Robin Millette