Delete some long-deprecated code

[fingolfin]

... to simplify the code, enabling further refactoring later on.

[fingolfin]

CC @mohamed-barakat not sure if you guys still use maketest anywhere (it seems to be in some homalg-project repositories, but mostly only old ones?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.33%. Comparing base (c63dfa2) to head (04760cb).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #286      +/-   ##
==========================================
+ Coverage   79.91%   81.33%   +1.41%     
==========================================
  Files          13       13              
  Lines        2241     2191      -50     
==========================================
- Hits         1791     1782       -9     
+ Misses        450      409      -41     

Files with missing lines	Coverage Δ
gap/AutoDocMainFunction.gd	100.00% <ø> (ø)
gap/AutoDocMainFunction.gi	81.23% <ø> (+6.08%)	⬆️
gap/Magic.gd	100.00% <ø> (ø)
gap/Magic.gi	72.72% <100.00%> (+2.10%)	⬆️

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[mohamed-barakat]

CC @mohamed-barakat not sure if you guys still use maketest anywhere (it seems to be in some homalg-project repositories, but mostly only old ones?

Thanks for the warning. Feel free to delete deprecated code, we will comply with new standards where necessary.