Possibility to run `ColumnGeneration` as the top algorithm

[rrsadykov]

[codecov[bot]]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (4944ce0) 87.00% compared to head (0ca091f) 86.88%.

Files	Patch %	Lines
src/Algorithm/colgen.jl	0.00%	10 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1132      +/-   ##
==========================================
- Coverage   87.00%   86.88%   -0.12%     
==========================================
  Files          88       88              
  Lines        7586     7596      +10     
==========================================
  Hits         6600     6600              
- Misses        986      996      +10     

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