Define supported groupings in config.py

[ChristianZimpelmann]

What problem do you want to solve?

Defining supported groupings in config.py and referring to them in interface.py instead of using the hardcoded groups there.

• Define supported groupings in config.py
• Rename two variables in line with name conventions
• Refer in several docstrings explicitely to level on which variable is calculated
• CHANGES.rst

[codecov]

Codecov Report

Merging #415 (9384b0e) into main (46c2d19) will decrease coverage by 0.00%.
The diff coverage is 97.56%.

@@            Coverage Diff             @@
##             main     #415      +/-   ##
==========================================
- Coverage   92.46%   92.46%   -0.01%     
==========================================
  Files          76       76              
  Lines        3705     3718      +13     
==========================================
+ Hits         3426     3438      +12     
- Misses        279      280       +1     

Impacted Files	Coverage Δ
...ttsim/social_insurance_contributions/arbeitsl_v.py	100.00% <ø> (ø)
...al_insurance_contributions/beitr_bemess_grenzen.py	100.00% <ø> (ø)
gettsim/taxes/eink_st.py	96.15% <ø> (ø)
gettsim/taxes/soli_st.py	100.00% <ø> (ø)
gettsim/taxes/zu_verst_eink/freibetraege.py	84.61% <ø> (ø)
gettsim/taxes/zu_verst_eink/zu_verst_eink.py	100.00% <ø> (ø)
gettsim/transfers/arbeitsl_geld.py	100.00% <ø> (ø)
gettsim/transfers/grunds_im_alter.py	100.00% <ø> (ø)
gettsim/transfers/kinderbonus.py	100.00% <ø> (ø)
gettsim/transfers/kindergeld.py	94.44% <ø> (ø)
... and 11 more

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[LauraGergeleit]

Looks good to me! :)