FIxes push to dev branch

[ziofil]

Context:
I accidentally pushed a few (working) commits to the develop branch

Description of the Change:
Makes the change official and finishes the job

[codecov]

Codecov Report

Merging #297 (4a6b8b0) into develop (34439fc) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #297   +/-   ##
========================================
  Coverage    80.03%   80.03%           
========================================
  Files           57       57           
  Lines         4858     4858           
========================================
  Hits          3888     3888           
  Misses         970      970           

Files	Coverage Δ
mrmustard/utils/settings.py	98.27% <ø> (ø)

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[SamFerracin]

Thanks for fixing the type hints! :) My bad
Could you also add docs to settings._force_hbar please?

Happy to approve after you reply to my other comment.

As an overall comment, I really dislike the force_hbar mechanism (which I have created, lol) that we use in tests, but I have no better ideas. We may have to think about better solutions for testing settings when we add the new backend. One way may be to test hbar=1 and backend=numpy during the day, and test hbar!=1 (as many values as we want) and backend=tensorflow with nightly workflows