removed ununsed asubtype relation between a ATree (achar) and a AType (\achar-class) to avoid confusion between types and values.

[jurgenvinju]

This cleans up some unused code. All tests seem to work still.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46%. Comparing base (56cb9d3) to head (3d09500).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##              main   #2533   +/-   ##
=======================================
  Coverage       46%     46%           
- Complexity    6670    6675    +5     
=======================================
  Files          795     795           
  Lines        65892   65892           
  Branches      9877    9877           
=======================================
  Hits         30695   30695           
+ Misses       32827   32821    -6     
- Partials      2370    2376    +6     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[PaulKlint]

Fair enough, these are unused.