Disable Parallelization

[atharva-2001]

📝 Description

Type: 🪲 bugfix | ☣️ breaking change

Related to #2021.
Raise error if nthreads!=1, show in the documentation(done in #2399)

📌 Resources

Examples, notebooks, and links to useful references.

🚦 Testing

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☑️ Checklist

• I requested two reviewers for this pull request
• I updated the documentation according to my changes
• I built the documentation by applying the build_docs label

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[andrewfullard]

Looks like it defaults to 1 if not defined

[codecov]

Codecov Report

Merging #2398 (891910e) into master (f80812b) will decrease coverage by 0.01%.
Report is 3 commits behind head on master.
The diff coverage is 50.00%.

❗ Current head 891910e differs from pull request most recent head 2bf7d1f. Consider uploading reports for the commit 2bf7d1f to get more accurate results

@@            Coverage Diff             @@
##           master    #2398      +/-   ##
==========================================
- Coverage   68.49%   68.49%   -0.01%     
==========================================
  Files         145      145              
  Lines       13245    13247       +2     
==========================================
+ Hits         9072     9073       +1     
- Misses       4173     4174       +1     

Files Changed	Coverage Δ
tardis/montecarlo/base.py	87.28% <50.00%> (-0.32%)	⬇️

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[andrewfullard]

Looks sensible to me.