clean setvarconstr!

[guimarqu]

• Fix set on var/constrs should not be done with the id  #328
• Close Kind of a constraint in an MOIOptimizer #266
• Close Sense of a variable #343
• Documentation
• new_varconstr.jl -> varconstr.jl
• perene -> peren
• curdata is back in Variable & Constraint

[codecov]

Codecov Report

Merging #331 into master will decrease coverage by 0.24%.
The diff coverage is 78.26%.

@@            Coverage Diff             @@
##           master     #331      +/-   ##
==========================================
- Coverage   75.40%   75.15%   -0.25%     
==========================================
  Files          51       51              
  Lines        3659     3619      -40     
==========================================
- Hits         2759     2720      -39     
+ Misses        900      899       -1     

Impacted Files	Coverage Δ
src/MOIcallbacks.jl	88.00% <0.00%> (ø)
src/MathProg/MathProg.jl	100.00% <ø> (ø)
src/MathProg/clone.jl	100.00% <ø> (ø)
src/MathProg/manager.jl	68.75% <ø> (-1.84%)	⬇️
src/MathProg/reformulation.jl	45.00% <0.00%> (ø)
src/MathProg/solutions.jl	55.55% <ø> (ø)
src/Algorithm/preprocessing.jl	52.25% <40.00%> (ø)
src/Algorithm/formstorages.jl	36.29% <50.00%> (ø)
src/MathProg/MOIinterface.jl	84.21% <66.66%> (ø)
src/MathProg/formulation.jl	68.84% <70.58%> (ø)
... and 8 more

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