Tree Search design

[guimarqu]

TODO (regressions):

• [x] fix test 550
• [x] fix test 591
• [x] fix broken tests
• [x] old - node finalizer
• [ ] branching tree file
• [ ] node ids (tree_order)

[codecov[bot]]

Codecov Report

Merging #667 (0d6cbde) into master (8d776fd) will decrease coverage by 0.38%. The diff coverage is 79.47%.

@@            Coverage Diff             @@
##           master     #667      +/-   ##
==========================================
- Coverage   85.55%   85.16%   -0.39%     
==========================================
  Files          50       58       +8     
  Lines        5435     5434       -1     
==========================================
- Hits         4650     4628      -22     
- Misses        785      806      +21     

Impacted Files	Coverage Δ
src/Algorithm/basic/solveipform.jl	91.96% <ø> (-0.15%)	:arrow_down:
src/Algorithm/basic/solvelpform.jl	91.17% <ø> (-0.13%)	:arrow_down:
src/Algorithm/benders.jl	88.96% <ø> (-0.12%)	:arrow_down:
src/Coluna.jl	100.00% <ø> (ø)
src/ColunaBase/hashtable.jl	65.00% <ø> (ø)
src/ColunaBase/interface.jl	30.76% <0.00%> (-19.24%)	:arrow_down:
src/MathProg/solutions.jl	81.01% <0.00%> (-2.11%)	:arrow_down:
src/Algorithm/treesearch/interface.jl	26.92% <26.92%> (ø)
src/Algorithm/conquer.jl	81.81% <44.44%> (-1.74%)	:arrow_down:
src/ColunaBase/recordmanager.jl	44.73% <44.73%> (ø)
... and 32 more

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