Fixed failures in rename_iris()

[jesper-friis]

Description

The --rename-iris is now actively used to generate emmo-for-humans.ttl.

Note: this PR is already in use for generation of https://w3id.org/emmo/emmo-for-humans, a version of EMMO that is only intended for examples which has all numerical IDs replaced with prefLabel's.
When merging this PR, please update the pip install EMMOntoPy statement in https://github.com/emmo-repo/EMMO/blob/master/.github/workflows/cd_update_pages.yml

Type of change

• Bug fix.
• New feature.
• Documentation update.
• Test update.

Checklist

This checklist can be used as a help for the reviewer.

• Is the code easy to read and understand?
• Are comments for humans to read, not computers to disregard?
• Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• Has the documentation been updated as necessary?
• Does this close the issue?
• Is the change limited to the issue?
• Are errors handled for all outcomes?
• Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.89%. Comparing base (de542a3) to head (5c7ffe3).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #820      +/-   ##
==========================================
- Coverage   72.90%   72.89%   -0.01%     
==========================================
  Files          18       18              
  Lines        3790     3789       -1     
==========================================
- Hits         2763     2762       -1     
  Misses       1027     1027              

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