Implement configurable and precise rounding

[mmomtchev]

This PR implements configurable and precise rounding of the results according to my proposal #128

[codecov-commenter]

Codecov Report

Base: 98.60% // Head: 98.32% // Decreases project coverage by -0.28% ⚠️

Coverage data is based on head (9c62ed8) compared to base (11162cb).
Patch coverage: 97.88% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
- Coverage   98.60%   98.32%   -0.29%     
==========================================
  Files          10       10              
  Lines        2080     2207     +127     
==========================================
+ Hits         2051     2170     +119     
- Misses         29       37       +8     

Impacted Files	Coverage Δ
src/geom.js	95.19% <66.66%> (-2.62%)	⬇️
src/flight.js	95.65% <75.00%> (-0.68%)	⬇️
src/scoring.js	99.57% <99.34%> (-0.18%)	⬇️
scoring-rules.config.js	100.00% <100.00%> (ø)
src/solution.js	99.70% <100.00%> (+1.52%)	⬆️
src/solver.js	96.24% <100.00%> (+0.02%)	⬆️

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