Reinforcement costs now computed and reported per-MW

[ppinchuk]

After taking a much closer look at the first round of reinforcement cost results, Trieu et al. decided that smaller wind/solar farms should not have to pay the same reinforcement costs as larger wind/solar farms. Instead, they wanted the cost to be a fraction proportional to the farm size, so the reinforcement costs are now computed and reported as $/MW instead of a flat dollar amount, which can then scale with the built-out plant size.

[codecov-commenter]

Codecov Report

Merging #174 (c8da5cd) into main (70ba350) will decrease coverage by 0.01%.
The diff coverage is 92.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #174      +/-   ##
==========================================
- Coverage   81.11%   81.11%   -0.01%     
==========================================
  Files         118      118              
  Lines       13728    13730       +2     
==========================================
+ Hits        11136    11137       +1     
- Misses       2592     2593       +1     

Flag	Coverage Δ
unittests	81.11% <92.30%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
...eVX/least_cost_xmission/least_cost_xmission_cli.py	51.69% <0.00%> (ø)
reVX/least_cost_xmission/least_cost_paths.py	97.71% <100.00%> (-0.04%)	⬇️
reVX/least_cost_xmission/trans_cap_costs.py	86.15% <100.00%> (+0.06%)	⬆️
tests/test_xmission_least_cost_paths.py	95.71% <100.00%> (ø)
reVX/handlers/database.py	0.00% <0.00%> (ø)
reVX/rpm/rpm_clusters.py	80.34% <0.00%> (+0.08%)	⬆️
reVX/plexos/plexos_plants.py	58.95% <0.00%> (+0.09%)	⬆️