Final retouches for historical variables

[fverdugo]

Fixes issue #155

[codecov-io]

Codecov Report

Merging #208 into master will increase coverage by 1.21%.
The diff coverage is 35.71%.

@@           Coverage Diff            @@
##           master   #208      +/-   ##
========================================
+ Coverage   87.79%    89%   +1.21%     
========================================
  Files         140    140              
  Lines        8634   8643       +9     
========================================
+ Hits         7580   7693     +113     
+ Misses       1054    950     -104

Impacted Files	Coverage Δ
src/Exports.jl	100% <ø> (ø)	⬆️
src/Inference/Inference.jl	59.25% <10%> (-28.98%)	⬇️
src/Arrays/Kernels.jl	72.8% <100%> (+0.44%)	⬆️
src/Geometry/QPointCellFields.jl	76% <100%> (+1%)	⬆️
src/FESpaces/StateLaws.jl	90% <0%> (+0.16%)	⬆️
src/ReferenceFEs/ExtrusionPolytopes.jl	89.69% <0%> (+0.3%)	⬆️
src/FESpaces/FESpaceFactories.jl	83.47% <0%> (+13.22%)	⬆️
src/FESpaces/CurlConformingFESpaces.jl	100% <0%> (+100%)	⬆️
src/ReferenceFEs/NedelecRefFEs.jl	100% <0%> (+100%)	⬆️

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