Replace dynamic sparse vector by a static one in Solution.

[guimarqu]

It was quite difficult to use the solution data structures because of the underlying dynamic sparse vector.

[codecov]

Codecov Report

Merging #710 (fc723eb) into master (c8d9db6) will decrease coverage by 0.09%.
The diff coverage is 86.15%.

@@            Coverage Diff             @@
##           master     #710      +/-   ##
==========================================
- Coverage   86.30%   86.20%   -0.10%     
==========================================
  Files          58       58              
  Lines        5703     5735      +32     
==========================================
+ Hits         4922     4944      +22     
- Misses        781      791      +10     

Impacted Files	Coverage Δ
src/MathProg/duties.jl	75.00% <ø> (ø)
src/MathProg/vcids.jl	91.17% <71.42%> (+1.17%)	⬆️
src/ColunaBase/hashtable.jl	53.33% <77.77%> (-10.31%)	⬇️
src/ColunaBase/solsandbounds.jl	88.51% <90.32%> (-0.38%)	⬇️
src/Algorithm/benders.jl	89.10% <100.00%> (-0.04%)	⬇️
src/MathProg/formulation.jl	81.98% <100.00%> (ø)
src/MathProg/manager.jl	68.29% <100.00%> (ø)
src/MathProg/solutions.jl	78.16% <100.00%> (-1.39%)	⬇️
... and 1 more

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