[RS] Update HypoTestInverterResult::ExclusionCleanup.
[RS] Update HypoTestInverterResult::ExclusionCleanup.

Update the cleanup routine. Prevent blind removal of all points when first point is -1.
Add cleaning up of failed fits as well, i.e., results where CLs < 0.

karies/root,root-mirror/root,olifre/root,olifre/root,karies/root,olifre/root,root-mirror/root,karies/root,karies/root,karies/root,olifre/root,karies/root,karies/root,root-mirror/root,olifre/root,karies/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,olifre/root,olifre/root,olifre/root,karies/root,root-mirror/root,karies/root,olifre/root,root-mirror/root