Remove children nodes from branching candidates

[rrsadykov]

Generating child nodes from branching candidates is moved from select!() to advanced_select!(). This allows us to simplify the interface of branching candidates (we remove nodes from them). This simplification also serves to prepare the diving implementation.

[codecov]

Codecov Report

Patch coverage: 93.10% and project coverage change: +0.03% 🎉

Comparison is base (afb1964) 82.56% compared to head (4c5580d) 82.60%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1072      +/-   ##
==========================================
+ Coverage   82.56%   82.60%   +0.03%     
==========================================
  Files          89       89              
  Lines        7148     7138      -10     
==========================================
- Hits         5902     5896       -6     
+ Misses       1246     1242       -4     

Files Changed	Coverage Δ
src/Branching/candidate.jl	0.00% <ø> (ø)
src/TreeSearch/TreeSearch.jl	8.33% <ø> (+0.64%)	⬆️
src/Branching/Branching.jl	70.87% <90.47%> (-0.83%)	⬇️
src/Algorithm/branching/printer.jl	96.87% <100.00%> (ø)
src/Algorithm/branching/scores.jl	90.47% <100.00%> (-0.12%)	⬇️
src/Algorithm/branching/single_var_branching.jl	87.50% <100.00%> (-0.50%)	⬇️

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