Database changes for file tables

Database changes for file tables

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.