Correction of a bug in strong branching

[rrsadykov]

Resolves issue #601

[codecov]

Codecov Report

Merging #602 (b2fe069) into master (1059e02) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #602      +/-   ##
==========================================
- Coverage   85.58%   85.50%   -0.09%     
==========================================
  Files          47       47              
  Lines        4801     4801              
==========================================
- Hits         4109     4105       -4     
- Misses        692      696       +4     

Impacted Files	Coverage Δ
src/Algorithm/branching/branchingalgo.jl	88.70% <100.00%> (-0.81%)	⬇️
src/Algorithm/branching/branchinggroup.jl	87.91% <0.00%> (-1.10%)	⬇️
src/ColunaBase/storage.jl	87.03% <0.00%> (-0.93%)	⬇️
src/Algorithm/conquer.jl	80.99% <0.00%> (-0.83%)	⬇️

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