Add individual field auditing

[GoogleCodeExporter]

Individual fields should be audited so a history of their values is 
available.  This will be on a per field basis.

The audit table would include:
Primary ID
Table Name
Field Name
Record ID
User ID
Old Value
New Value

This feature would allow for an individual value, such as an amount, to 
have its previous values exposed and would indicate who made the change to 
the record.  This would require rather extensive changes to the insert, 
update, and delete queries.

This is a low priority feature and is not required in the first version of 
the application.

Original issue reported on code.google.com by jjhatf02 on 16 Mar 2010 at 10:16