ENH: Add the option the specify additional weights for system- & descriptor-specific ARMC sub-errors

[BvB93]

Adds the ability to specify additional (scalar) weights for ARMC errors via the new pes.<descriptor-name>.weight option. The option expects a list of weights, one for every to-be optimized system.

Examples

pes:
    rdf:
        weight: [1, 2, 2.5]
        func: FOX.MultiMolecule.init_rdf

job:
    molecule:
        - /path/to/md_acetate.xyz
        - /path/to/md_phosphate.xyz
        - /path/to/md_sulfate.xyz

[codecov[bot]]

Codecov Report

Merging #289 (9725c54) into master (0f6bd38) will increase coverage by 0.03%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
+ Coverage   71.24%   71.27%   +0.03%     
==========================================
  Files          66       66              
  Lines        7299     7314      +15     
  Branches     1542     1546       +4     
==========================================
+ Hits         5200     5213      +13     
- Misses       1771     1772       +1     
- Partials      328      329       +1     

Impacted Files	Coverage Δ
FOX/armc/armc.py	85.71% <50.00%> (+0.05%)	:arrow_up:
FOX/armc/sanitization.py	88.83% <66.66%> (-0.33%)	:arrow_down:
FOX/armc/armc_pt.py	87.90% <100.00%> (+0.29%)	:arrow_up:
FOX/armc/monte_carlo.py	79.37% <100.00%> (+0.28%)	:arrow_up:
FOX/armc/schemas.py	93.75% <100.00%> (+0.06%)	:arrow_up: