Improve macronode reduction function

[ilan-tz]

Context for changes

< Describe your changes. Make sure to include a summarized description of the changes and fixed issues in the format below consistent with CHANGELOG.md. You cannot place N/A here. >

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Example usage and tests

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Performance results justifying changes

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Workflow actions and tests

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Expected benefits and drawbacks

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Related Github issues

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Checklist and integration statements

• My Python and C++ codes follow the coding and commenting styles of this project as indicated by existing files. Specifically, the changes conform to given black, docformatter and pylint configurations.
• I have performed a self-review of these changes, checked my code (including for codefactor compliance), and corrected misspellings to the best of my capacity. I have synced this branch with others as required.
• I have added context for corresponding changes in documentation and README.md as needed.
• I have added new workflow CI tests for corresponding changes, ensuring codecoverage 95% or better, and these pass locally for me.
• I have updated CHANGELOG.md following the template. I recognize that the developers may revisit CHANGELOG.md and the versioning, and create a Special Release including my changes.

[codecov]

Codecov Report

Merging #49 (5a74c7c) into main (d9c3c00) will decrease coverage by 0.02%.
The diff coverage is 98.29%.

❗ Current head 5a74c7c differs from pull request most recent head 831117b. Consider uploading reports for the commit 831117b to get more accurate results

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   96.32%   96.30%   -0.03%     
==========================================
  Files          35       35              
  Lines        2123     2137      +14     
==========================================
+ Hits         2045     2058      +13     
- Misses         78       79       +1     

Impacted Files	Coverage Δ
flamingpy/cv/macro_reduce.py	95.39% <98.11%> (-0.26%)	⬇️
flamingpy/examples/macro_reduce.py	96.87% <100.00%> (ø)
flamingpy/simulations.py	95.65% <100.00%> (ø)

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