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Performance additions to generic 2-cohomology and Automorphism group/…
…Isomorphism test (#4219) * ENHANCE: Added CompositionSeriesThrough * ENHANCE: Performance improvements generic 2-cohomology - Speed up collection process for 2-cohomology - If factor permrep is large, do first try for stabilizer - when computing permdegree, avoid the bold first attempt to be too bad. * ENHANCE: Isomorphism/Automorphism speedups - Better composition series choice in `SubgroupConditionAbove` -- move known parts on bottom - Improvements in normalizers in `SubgroupConditionAbove`. Use NormalizerViaRadical if there is huge radical bit. - Delay bottom permrep, if bounded orbit algorithms will do the job. - Allow forcing old isomorphism test - Redo generators when searching for trick relators - Require to stabilize sets of normal subgroups (may reduce in factor) Also Typo fix/remove outdated comment in gpfpiso * ENHANCE: ``onlyone'' option for `ContainedConjugates` * FIX: IntermediateGroup will not exit quietly if index is large Co-authored-by: Wilf Wilson <wilf@wilf-wilson.net>
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