Unified fe constuctor + zero mean FE Space

[fverdugo]

No description provided.

[codecov-io]

Codecov Report

Merging #102 into master will decrease coverage by 0.09%.
The diff coverage is 87.96%.

@@            Coverage Diff            @@
##           master     #102     +/-   ##
=========================================
- Coverage   92.46%   92.36%   -0.1%     
=========================================
  Files          85       87      +2     
  Lines        4404     4532    +128     
=========================================
+ Hits         4072     4186    +114     
- Misses        332      346     +14

Impacted Files	Coverage Δ
src/Utils/Helpers.jl	71.42% <0%> (ø)	⬆️
src/FESpaces/FEOperators.jl	81.37% <100%> (+1.58%)	⬆️
src/FESpaces/ZeroMeanFESpaces.jl	100% <100%> (ø)
src/Utils/CachedSubVectors.jl	87.5% <100%> (+1.78%)	⬆️
src/FESpaces/FESpaceConstructors.jl	80.26% <80.26%> (ø)
src/Geometry/DiscreteModels.jl	95.2% <0%> (+0.59%)	⬆️

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