🩹 Fix 'dataset_groups' not shown in model markdown

[s-weigand]

Adds the Dataset Groups subsection to the markdown representation of model (used in the markdown report).

Change summary

• 🧪 Added failing test case showing the expected output of Model.markdown
• 🩹 Change Model.markdown to satisfy the test

Checklist

• ✔️ Passing the tests (mandatory for all PR's)
• 👌 Closes issue (mandatory for ✨ feature and 🩹 bug fix PR's)
• 🧪 Adds new tests for the feature (mandatory for ✨ feature and 🩹 bug fix PR's)

Closes issues

closes #885

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.64%.

Quality metrics	Before	After	Change
Complexity	2.97 ⭐	3.23 ⭐	0.26 👎
Method Length	68.70 🙂	69.50 🙂	0.80 👎
Working memory	6.63 🙂	6.69 🙂	0.06 👎
Quality	72.39% 🙂	71.75% 🙂	-0.64% 👎

Other metrics	Before	After	Change
Lines	870	952	82

Changed files	Quality Before	Quality After	Quality Change
glotaran/model/model.py	72.40% 🙂	70.82% 🙂	-1.58% 👎
glotaran/model/test/test_model.py	72.38% 🙂	72.58% 🙂	0.20% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
glotaran/model/model.py	Model.markdown	13 🙂	168 😞	10 😞	48.74% 😞	Try splitting into smaller methods. Extract out complex expressions
glotaran/model/model.py	Model.from_dict	12 🙂	162 😞	10 😞	50.19% 🙂	Try splitting into smaller methods. Extract out complex expressions
glotaran/model/model.py	Model._add_dict_items	10 🙂	97 🙂	11 😞	57.81% 🙂	Extract out complex expressions
glotaran/model/test/test_model.py	test_fill	0 ⭐	243 ⛔	7 🙂	62.26% 🙂	Try splitting into smaller methods
glotaran/model/model.py	Model._add_list_items	9 🙂	76 🙂	10 😞	63.66% 🙂	Extract out complex expressions

Legend and Explanation

The emojis denote the absolute quality of the code:

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• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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Help us improve this quality report!

[github-actions]

👈 Launch a binder notebook on branch s-weigand/pyglotaran/add-dataset_groups-to-md

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
2.1% Duplication

[codecov]

Codecov Report

Merging #906 (d313129) into main (ded0711) will increase coverage by 0.0%.
The diff coverage is 100.0%.

@@          Coverage Diff          @@
##            main    #906   +/-   ##
=====================================
  Coverage   84.7%   84.8%           
=====================================
  Files         81      81           
  Lines       4603    4610    +7     
  Branches     849     851    +2     
=====================================
+ Hits        3902    3910    +8     
+ Misses       559     558    -1     
  Partials     142     142           

Impacted Files	Coverage Δ
glotaran/model/model.py	85.4% <100.0%> (+0.4%)	⬆️
glotaran/testing/model_generators.py	89.6% <0.0%> (+0.9%)	⬆️

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[jsnel]

LGTM! 👍