Modification tracking

[rswalters]

There is no trace back to who is modifying the status of a request. We need to be able to track this so when there is a change we can point to who made it. Possible solutions are

1. In the SedmDB script add a logging function for all request. This will at least show all changes and when they were made, but not who made the change.

2. Add a modification table in the database. Works the same as above but each change is marked in the table.

3. All the above