Updates for feature matching work + prefilter match contestants by target distance to make search group smaller (and hopfully find more better matches and have look through less noise.)  Initial results are less convincing than I hoped, but I still think it's valuable, but maybe more of an incremental improvement rather than a home run.
Updates for feature matching work + prefilter match contestants by target
distance to make search group smaller (and hopfully find more better matches
and have look through less noise.)  Initial results are less convincing than
I hoped, but I still think it's valuable, but maybe more of an incremental
improvement rather than a home run.


Former-commit-id: 2e21072ad2a77181aa5488ae25e0b8cf773b450b
UASLab/ImageAnalysis