modify meshing script to save given meshing command

[keiyamamo]

This PR introduces a feature to save command-line arguments to a file.
This should ensure the reproducibility of the mesh.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.05%. Comparing base (8a6dcb2) to head (19030d3).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #192      +/-   ##
==========================================
- Coverage   79.09%   79.05%   -0.05%     
==========================================
  Files          32       32              
  Lines        3812     3819       +7     
==========================================
+ Hits         3015     3019       +4     
- Misses        797      800       +3     

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[johannesring]

You can already ensure the reproducibility of a mesh by using a config file and the --config option in vasp-generate-mesh, so I am not sure how useful this is.

[johannesring]

I am fine with merging this if you want to have this functionality.

[keiyamamo]

I agree config does the job, but this could be convenient for situations where you want to test different parameters and keep track of the command over time. I will merge it but please let me know if this becomes annoying, we can then reverse the change anytime :)