Merge RecogniseAn and RecogniseSn into RecogniseGiant

[TWiedemann]

• Resolves RecogniseAn recognises symmetric group as alternating group #381 by doing what the title says
• Similarly to NiceGeneratorsSn: Improve documentation, rename variables, restructure code, add tests #369 and NiceGeneratorsAn (Odd and Even): Improve documentation, rename variables, restructure code, add tests #382, improves the documentation of ConjEltSn, ConjEltAnEven and ConjEltAnOdd and refactors the code slightly.

[codecov]

Codecov Report

❌ Patch coverage is 89.04110% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.02%. Comparing base (703d1e1) to head (025bd2f).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
gap/perm/giant.gi	89.04%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #391      +/-   ##
==========================================
+ Coverage   72.67%   73.02%   +0.34%     
==========================================
  Files          43       43              
  Lines       18400    18383      -17     
==========================================
+ Hits        13373    13424      +51     
+ Misses       5027     4959      -68     

Files with missing lines	Coverage Δ
gap/perm/giant.gi	88.96% <89.04%> (+14.62%)	⬆️

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[fingolfin]

nice, thanks!