valid inequalities

[matbesancon]

Adding the first draft for valid inequalities.
There are still pieces missing I need to figure out and the main algorithm looping over constraints and tightening the bounds

[codecov]

Codecov Report

Merging #141 (454f0cb) into master (4bdf3e2) will decrease coverage by 1.63%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
- Coverage   89.16%   87.53%   -1.64%     
==========================================
  Files          10       11       +1     
  Lines        1449     1476      +27     
==========================================
  Hits         1292     1292              
- Misses        157      184      +27     

Impacted Files	Coverage Δ
src/jump_attributes.jl	92.59% <ø> (ø)
src/valid_inequalities.jl	0.00% <0.00%> (ø)

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[matbesancon]

@joaquimg I'll need some help on some parts here, getting the variables from both levels and copying them into a new model that gets high point relaxation + dual feasibility constraints

[matbesancon]

bump here

[joaquimg]

this is in my todo list :)