Add browsable history to compatibility reports

[abaire]

Currently only the latest test report is visible for each title in the compatibility list. This can lead to information loss, e.g., if a title performs well on one configuration but not on another, or if a tester provides a report of poor quality.

It'd be very useful to be able to search back through recent history to read prior reports.

Ideally consecutive reports by the same user should be collapsed (to handle situations like a user reporting a title as "perfect" and then immediately realizing it is not).

It'd also be very useful to allow a privileged role to delete or hide reports.