Enable more linting rules and adjust the code

[AndrewSazonov]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.21%. Comparing base (883c384) to head (2c625cc).
⚠️ Report is 46 commits behind head on develop.

Files with missing lines	Patch %	Lines
...asydiffraction/datablocks/experiment/item/enums.py	16.66%	5 Missing ⚠️
...ydiffraction/analysis/categories/fit_mode/enums.py	0.00%	1 Missing ⚠️
...tablocks/experiment/categories/background/enums.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #148      +/-   ##
===========================================
+ Coverage    82.26%   89.21%   +6.95%     
===========================================
  Files           88      134      +46     
  Lines         5451     7694    +2243     
  Branches       454      723     +269     
===========================================
+ Hits          4484     6864    +2380     
+ Misses         802      600     -202     
- Partials       165      230      +65     

Flag	Coverage Δ
integration	74.96% <68.57%> (+5.01%)	⬆️
unittests	79.90% <71.42%> (+7.46%)	⬆️

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