Clean up nodal reffe

[fverdugo]

No description provided.

[fverdugo]

Further addresses issue #314

[codecov-commenter]

Codecov Report

Merging #321 into master will increase coverage by 0.07%.
The diff coverage is 95.82%.

@@            Coverage Diff             @@
##           master     #321      +/-   ##
==========================================
+ Coverage   88.42%   88.50%   +0.07%     
==========================================
  Files         152      152              
  Lines       10342    10265      -77     
==========================================
- Hits         9145     9085      -60     
+ Misses       1197     1180      -17     

Impacted Files	Coverage Δ
src/Geometry/UnstructuredGrids.jl	69.29% <ø> (ø)
src/ReferenceFEs/ReferenceFEs.jl	100.00% <ø> (ø)
src/Visualization/Vtk.jl	93.00% <ø> (ø)
src/ReferenceFEs/LagrangianRefFEs.jl	94.24% <93.75%> (-1.87%)	⬇️
src/ReferenceFEs/CLagrangianRefFEs.jl	96.09% <96.09%> (ø)
src/FESpaces/CellBases.jl	87.64% <100.00%> (ø)
src/FESpaces/FESpaceFactories.jl	85.29% <100.00%> (+1.47%)	⬆️
src/FESpaces/SparseMatrixAssemblers.jl	98.01% <100.00%> (ø)
src/Geometry/Triangulations.jl	78.48% <100.00%> (-1.27%)	⬇️
src/ReferenceFEs/CDLagrangianRefFEs.jl	92.14% <100.00%> (-6.40%)	⬇️
... and 41 more

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