Remove auto_nbands handling + fix bravais inconsistency handling

[esoteric-ephemera]

Major changes:

• Change auto_nbands to only throw a warning and not attempt to change the VASP job, as per original intention. VASP already updates NBANDS to accommodate parallelization settings so the handler here is doing more harm (esp. in bandstructure sweeps) than good
• Update the bravais handling to reflect advice from VASP devs and the docstr that's there

[codecov-commenter]

Codecov Report

❌ Patch coverage is 26.66667% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.74%. Comparing base (312d4cf) to head (5e3749d).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/custodian/vasp/handlers.py	0.00%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #409      +/-   ##
==========================================
+ Coverage   53.66%   53.74%   +0.07%     
==========================================
  Files          39       39              
  Lines        3557     3541      -16     
==========================================
- Hits         1909     1903       -6     
+ Misses       1648     1638      -10     

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[Andrew-S-Rosen]

@esoteric-ephemera: There are some merge conflicts now, unfortunately. Would you be willing to resolve them? Once you do, I'd be happy to consider this for merging.

[Andrew-S-Rosen]

Note: This PR would also close #368 by making it obsolete.

[esoteric-ephemera]

@Andrew-S-Rosen there's something a bit off with the one lobster test, will figure it out today

[Andrew-S-Rosen]

@esoteric-ephemera --- this looks good to me. Ready for merge?

[esoteric-ephemera]

Yep should be good! It'd be good to eventually try to patch the tests to be more robust. I was getting huge numbers of files written out running everything locally with pytest-xdist

[Andrew-S-Rosen]

try to patch the tests to be more robust.

Agreed. But for another day...