ENH: Round the net charge to the nearest integer

[BvB93]

Ensure that the cached net charge is rounded to the nearest integer.

[codecov]

Codecov Report

Merging #258 (1af1d28) into master (6d2a241) will increase coverage by 0.01%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
+ Coverage   75.23%   75.24%   +0.01%     
==========================================
  Files          65       65              
  Lines        6929     6937       +8     
  Branches     1247     1248       +1     
==========================================
+ Hits         5213     5220       +7     
- Misses       1384     1385       +1     
  Partials      332      332              

Impacted Files	Coverage Δ
FOX/armc/param_mapping.py	84.67% <75.00%> (-0.15%)	⬇️
FOX/armc/sanitization.py	89.92% <100.00%> (+0.02%)	⬆️
FOX/functions/charge_utils.py	86.99% <100.00%> (+0.21%)	⬆️
FOX/logger.py	83.82% <100.00%> (+0.24%)	⬆️
FOX/io/read_psf.py	79.92% <0.00%> (ø)

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