Proposition for presolve interface + put back StaticVarConstrUnit usage

[rrsadykov]

No description provided.

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: +15.62% 🎉

Comparison is base (0dbbc5c) 66.94% compared to head (73aea53) 82.56%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1068       +/-   ##
===========================================
+ Coverage   66.94%   82.56%   +15.62%     
===========================================
  Files          89       89               
  Lines        7116     7148       +32     
===========================================
+ Hits         4764     5902     +1138     
+ Misses       2352     1246     -1106     

Files Changed	Coverage Δ
src/Algorithm/benders.jl	3.44% <0.00%> (+3.44%)	⬆️
src/Algorithm/presolve/interface.jl	78.98% <0.00%> (+78.25%)	⬆️
src/Algorithm/basic/solveipform.jl	82.24% <100.00%> (+0.16%)	⬆️
src/Algorithm/basic/solvelpform.jl	90.69% <100.00%> (+2.60%)	⬆️
src/Algorithm/colgen.jl	83.33% <100.00%> (+1.51%)	⬆️

... and 37 files with indirect coverage changes

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