Add ReLOC - Initial alignment algorithm #1
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ReLOC is an initial alignment algorithm proposed in:
Petrelli A., Di Stefano L., "Pairwise registration by local orientation cues", Computer Graphics Forum, 2015.
It requires the FLARE method for the computation of repeatable reference frames. FLARE method is implemented by the FLARELocalReferenceFrameEstimation class proposed through the pull request PointCloudLibrary#1571.
ReLOC requires also some changes of Hough Voting and RANSAC. Moreover, it introduces the FlatKeypoint detector.