Associate results with app version

[davea]

Add fields to result table:

• app_versionid (DB ID of app version, or 0 if anonymous platform)
• flops_estimate: what's returned by app_plan(), or p_fpops

This will accomplish at least 2 things:

• make it easier to analyze errors (i.e. what app versions are causing them)
• provide a generic way of computing claimed credit, namely elapsed time * flops_estimate

[davea]

Also: (requested by Kevin): add a field that stores the timestamp when the result reached its 'final' status. I.e. this field would be set when the result reaches one of the final statuses:

server_state = 5 and outcome = 1 and validate_state in (1,2) or server_state = 5 and outcome in (3,5)

[Nicolas]

Format description.

[davea]

Also: report and store CPU time and elapsed time separately.