better IsAlmostSimple support in AllPrimitiveGroups

[ThomasBreuer]

Up to now, the groups had to be constructed and were checked. Now we use that IsAlmostSimple is determined by ONanScottType.

The IsAlmostSimpleGroup flag is now set in the groups returned by PrimitiveGroup.

(The primgrp package does not say which functions have special support in AllPrimitiveGroups, but is_almost_simple is listed in the Oscar documentation.)

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.13%. Comparing base (dbae2c0) to head (3bad94f).

Files with missing lines	Patch %	Lines
lib/primitiv.gi	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #79      +/-   ##
==========================================
+ Coverage   99.11%   99.13%   +0.01%     
==========================================
  Files          46       46              
  Lines       38324    38338      +14     
==========================================
+ Hits        37984    38005      +21     
+ Misses        340      333       -7     

Files with missing lines	Coverage Δ
lib/primitiv.gi	60.34% <92.85%> (+2.19%)	⬆️

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[fingolfin]

Thanks @ThomasBreuer! I let Claude have a closer look, and it pointed out three issues:

1. Documentation: lib/primitiv.gd:166-172 does list which properties come from the database. IsAlmostSimpleGroup should be added there.
2. CHANGES.md should be updated with this
3. "values" can also be lists, which this does not support

AllPrimitiveGroups(NrMovedPoints,12,IsAlmostSimple,[true])       ->  0  (want 6)
AllPrimitiveGroups(NrMovedPoints,12,IsAlmostSimple,[true,false]) ->  0  (want 6)
AllPrimitiveGroups(NrMovedPoints,12,IsSimple,[true,false])       ->  6  (correct)

Wrong answer, no error. STGSelFunc already dispatches on true/false/
function/list, so delegating to it fixes all cases and removes both the
four-way branch and the hand-maintained type blacklist:

elif a=IsAlmostSimpleGroup or a=IsAlmostSimple then
  # for primitive groups, almost simple means O'Nan-Scott type 2
  bfunc:= b;
  b:= val -> STGSelFunc(val = "2", bfunc);
  gut[i]:=Filtered(gut[i],j->STGSelFunc(PRIMGrp(i,j)[4],b));