Refactors solver/__init__.py

[maxnus]

Fixing cluster dump examples (#138), making all solver strings case-sensitive, and hopefully not breaking anything...

[codecov]

Codecov Report

Patch coverage: 69.76% and project coverage change: -0.02% ⚠️

Comparison is base (29b945b) 71.53% compared to head (02df0f0) 71.51%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
- Coverage   71.53%   71.51%   -0.02%     
==========================================
  Files         152      152              
  Lines       20159    20130      -29     
  Branches     3343     3327      -16     
==========================================
- Hits        14420    14396      -24     
+ Misses       4906     4902       -4     
+ Partials      833      832       -1     

Files Changed	Coverage Δ
vayesta/solver/__init__.py	74.57% <66.66%> (-2.70%)	⬇️
vayesta/core/qemb/fragment.py	76.29% <100.00%> (ø)
vayesta/core/qemb/qemb.py	73.83% <100.00%> (ø)
vayesta/edmet/edmet.py	78.46% <100.00%> (ø)
vayesta/edmet/fragment.py	65.01% <100.00%> (ø)

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