Update policy for date

[MaxBlesch]

What problem do you want to solve?

The docstrings in policy_for_date.py are either incomplete or not existent. I will complete the docstrings and refactor the code to have a more readable structure.

Todo

• Complete docstrings.
• Refactor code get_policies_for_date.
• Delete references to jahr and switch completely to datum.
• Allow for integer as year. This partly covers Allow for int / DateTime as policy date #190 .

[codecov]

Codecov Report

Merging #196 into master will decrease coverage by 0.49%.
The diff coverage is 83.82%.

@@            Coverage Diff             @@
##           master     #196      +/-   ##
==========================================
- Coverage   95.25%   94.76%   -0.50%     
==========================================
  Files          54       54              
  Lines        1561     1584      +23     
==========================================
+ Hits         1487     1501      +14     
- Misses         74       83       +9     

Impacted Files	Coverage Δ
gettsim/tests/test_arbeitsl_geld.py	100.00% <ø> (ø)
gettsim/tests/test_arbeitsl_geld_2.py	100.00% <ø> (ø)
gettsim/tests/test_benefit_checks.py	100.00% <ø> (ø)
gettsim/tests/test_eink_st.py	100.00% <ø> (ø)
gettsim/tests/test_elterngeld.py	100.00% <ø> (ø)
gettsim/tests/test_favorability_check.py	100.00% <ø> (ø)
gettsim/tests/test_kindergeld.py	100.00% <ø> (ø)
gettsim/tests/test_kinderzuschlag.py	100.00% <ø> (ø)
gettsim/tests/test_soli_st.py	100.00% <ø> (ø)
gettsim/tests/test_soz_vers.py	100.00% <ø> (ø)
... and 10 more

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[tobiasraabe]

Hi Max, here is my preliminary review. I will review after the changes are discussed and maybe implemented.

[tobiasraabe]

Very nice PR! 👍 There are a lot of small improvements, enhanced readability, etc..