Integrate fixed vars with MOI interface

[guimarqu]

No description provided.

[codecov]

Codecov Report

Base: 86.06% // Head: 85.97% // Decreases project coverage by -0.09% ⚠️

Coverage data is based on head (a63e95c) compared to base (fc706ea).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #723      +/-   ##
==========================================
- Coverage   86.06%   85.97%   -0.10%     
==========================================
  Files          58       58              
  Lines        5742     5405     -337     
==========================================
- Hits         4942     4647     -295     
+ Misses        800      758      -42     

Impacted Files	Coverage Δ
src/Algorithm/treesearch.jl	83.33% <ø> (ø)
src/MathProg/solutions.jl	76.00% <ø> (+1.92%)	⬆️
src/MathProg/MOIinterface.jl	71.78% <100.00%> (+3.45%)	⬆️
src/MathProg/formulation.jl	83.62% <100.00%> (+0.77%)	⬆️
src/MathProg/vcids.jl	75.75% <0.00%> (-12.82%)	⬇️
src/ColunaBase/interface.jl	50.00% <0.00%> (-7.15%)	⬇️
src/MathProg/duties.jl	69.23% <0.00%> (-5.77%)	⬇️
src/Algorithm/treesearch/explore.jl	86.36% <0.00%> (-2.10%)	⬇️
src/Algorithm/interface.jl	87.80% <0.00%> (-1.56%)	⬇️
src/MathProg/constraint.jl	81.81% <0.00%> (-1.52%)	⬇️
... and 39 more

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