Column already insert not an error anymore

[guimarqu]

The ColumnAlreadyInsertedColGenError was happening too frequently. It is now a warning. The user can choose to throw the warning by using the throw_column_already_inserted_warning parameter in colgen. He can also choose to hide the warning by setting show_column_already_inserted_warning to false.

close #747

[codecov]

Codecov Report

Base: 86.90% // Head: 86.97% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (6b47b37) compared to base (a1b2bcc).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #753      +/-   ##
==========================================
+ Coverage   86.90%   86.97%   +0.06%     
==========================================
  Files          59       59              
  Lines        5423     5427       +4     
==========================================
+ Hits         4713     4720       +7     
+ Misses        710      707       -3     

Impacted Files	Coverage Δ
src/Algorithm/colgen.jl	87.47% <100.00%> (+0.71%)	⬆️

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