compute threshold in memodel example if not threshold-based protocols

[AurelienJaquier]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.45%. Comparing base (737fa7d) to head (7c4ece3).
Report is 1 commits behind head on main.

Additional details and impacted files

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##             main     #154   +/-   ##
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  Coverage   53.44%   53.45%           
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  Files         122      122           
  Lines        9667     9668    +1     
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+ Hits         5167     5168    +1     
  Misses       4500     4500           

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[AurelienJaquier]

I have increased the precision of threshold search, because for some cells with low threshold, the search was not very good (e.g. finding threshold at 0.023 when 'real' threshold is at 0.016). However, this will make the optimisations non-reproducible with the next BPEM version. Is that ok @darshanmandge ?

[darshanmandge]

Is it possible to have precision set only for me-models for now and not for emodels? All the emodels built won't generate the same result if we do this which might be a problem for reproducibility of downstream results e.g. if they have been used in a circuit .