Fixing issue with linear algebra threads

[ngomezve]

This PR is a simplified version of PR #58. It just adds the final fix that we found for the LU decomposition issue in blax(), which would take 3 orders of magnitude longer on a server with 1 CPU than it should.

The issue is resolved by setting the number of threads in the OpenBLAS linear algebra library to 1, to avoid any parallelization. Note that this may become an issue in the future if explicit parallelization is attempted in TASOPT. For now, it should provide significant speed improvements if run on a server.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.27%. Comparing base (78ba4b2) to head (a1371a0).
Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
+ Coverage   76.41%   78.27%   +1.85%     
==========================================
  Files          69       71       +2     
  Lines       13169    13420     +251     
==========================================
+ Hits        10063    10504     +441     
+ Misses       3106     2916     -190     

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