Add support for disabling contributions for selected atoms

[awvwgk]

Closes #75

[codecov]

Codecov Report

❌ Patch coverage is 24.03846% with 79 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.58%. Comparing base (55b886f) to head (832902d).

Files with missing lines	Patch %	Lines
app/cli.f90	0.00%	65 Missing and 1 partial ⚠️
src/dftd3/api.f90	57.14%	3 Missing and 3 partials ⚠️
src/dftd3/model.f90	57.14%	0 Missing and 3 partials ⚠️
python/dftd3/ase.py	71.42%	2 Missing ⚠️
app/argument.f90	0.00%	0 Missing and 1 partial ⚠️
python/dftd3/library.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
- Coverage   65.42%   64.58%   -0.85%     
==========================================
  Files          36       36              
  Lines        4975     5074      +99     
  Branches     1723     1775      +52     
==========================================
+ Hits         3255     3277      +22     
- Misses        738      809      +71     
- Partials      982      988       +6     

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