Refactor cljam.algo.level.

[alumi]

Summary

Refactored cljam.algo.level

Changes

• Reduced the number of stages, 3 => 2.
  • [before] serial splitting -> parallel processing -> serial merging
  • [after] parallel processing & splitting -> serial merging
• Use volatile thread-local state to compute levels.

[codecov]

Codecov Report

Merging #93 into master will decrease coverage by 0.09%.
The diff coverage is 82.85%.

@@            Coverage Diff            @@
##           master      #93     +/-   ##
=========================================
- Coverage   83.22%   83.13%   -0.1%     
=========================================
  Files          60       60             
  Lines        4162     4132     -30     
  Branches      452      451      -1     
=========================================
- Hits         3464     3435     -29     
  Misses        246      246             
+ Partials      452      451      -1

Impacted Files	Coverage Δ
src/cljam/algo/level.clj	82.97% <82.85%> (-5.34%)	⬇️

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[totakke]

LGTM