omp loop fix

[gitpeterwind]

I don't understand why, but an omp loop was causing error some times (but not always for two consecutive identical runs!)
I changed the schedule from dynamic to static, and then it seems to always pass.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (0a5b538) 65.65% compared to head (e495d5f) 65.67%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/utils/ComplexFunction.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #235      +/-   ##
==========================================
+ Coverage   65.65%   65.67%   +0.02%     
==========================================
  Files         185      185              
  Lines       10237    10233       -4     
==========================================
  Hits         6721     6721              
+ Misses       3516     3512       -4     

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