Implement MOI callbacks

[odow]

Implements the MOI callbacks added jump-dev/MathOptInterface.jl#782

See also: jump-dev/Gurobi.jl#258

Requires:

• a new tag of MOI and a minimum bound
• Remove Manifest.toml

TODOs

• tests currently failing with a segfault, sometimes proceeded (depending on small code changes) by

glp_delete_prob: operation not allowed
Error detected in file api/prob1.c at line 1582
error in running finalizer: GLPK.GLPKFatalError(msg="GLPK call failed. All GLPK objects you defined so far are now invalidated.")

[codecov-io]

Codecov Report

Merging #120 into master will increase coverage by 1.45%.
The diff coverage is 99.24%.

@@            Coverage Diff             @@
##           master     #120      +/-   ##
==========================================
+ Coverage   81.69%   83.14%   +1.45%     
==========================================
  Files           4        5       +1     
  Lines        1857     1952      +95     
==========================================
+ Hits         1517     1623     +106     
+ Misses        340      329      -11

Impacted Files	Coverage Δ
src/GLPK.jl	80% <ø> (+1.4%)	⬆️
src/MOI_callbacks.jl	100% <100%> (ø)
src/MOI_wrapper.jl	89.69% <98.68%> (-0.45%)	⬇️
src/GLPK_checks.jl	70.32% <0%> (+2.93%)	⬆️

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[coveralls]

Coverage increased (+1.9%) to 78.314% when pulling 37b423d on od/callbacks into 4ac8342 on master.

[coveralls]

Coverage increased (+4.3%) to 81.048% when pulling 12b210d on od/callbacks into b5183be on master.

[odow]

This is now passing tests and ready for another review.

[blegat]

Exciting!