Adds an exception if the user requests atoms with number greater than 94

[andrewfullard]

📝 Description

Type: 🪲 bugfix

Fixes #171. True fix is to have Carsus handle isotopes correctly.

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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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[AlexHls]

Looks good to me!
Is it possible to also add this in a brief warning note in the documentation (e.g. on the https://tardis-sn.github.io/carsus/io/nist.html page)?
I feel it would be better to warn new users through the documentation instead of having them find out exclusively via a ValueError.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 68.59%. Comparing base (fc47fbd) to head (85c1593).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
carsus/io/nist/weightscomp.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #401      +/-   ##
==========================================
- Coverage   68.87%   68.59%   -0.29%     
==========================================
  Files          31       31              
  Lines        3733     3830      +97     
==========================================
+ Hits         2571     2627      +56     
- Misses       1162     1203      +41     

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