algo/vidjil.cpp: enable filtering by defaut, -Z 3
Thanks to the work by @boreec, we now enable by default the filtering for the second pass of the clone analysis. When the computing time is dominated by the FineSegmenter (such as with '-c clones -z 10000' or '-c segment'), we get final speed-ups between 2x and 15x (#2360). We could even set -Z 1 in most of the cases, but it should be coupled with #3225. See also #3297 and #3344. Close #3298.
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