Have aggregate query scores summed instead of averaged for the gain based metrics

[david-fisher]

Is your feature request related to a problem? Please describe.
The aggregate score for the set of queries in the case shows the average of the scores for each of the queries. This is not very meaningful for the gain based metrics, CG and DCG.

Describe the solution you'd like
Those two metrics could be summed up, instead of average, giving a clearer picture of the change in the full case when updating judgments on a query.

Describe alternatives you've considered
None
Additional context

[epugh]

Was moving too fast!

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Please do advocate for this issue and ideally submit a patch to get the attention of the maintainers!

[epugh]

Going through the new Search Quality class and that reminded me that we really need to get this to fixed. The cobblers children have no shoes ;-(

[epugh]

I really wish we had this........ :-(