Implement p disct reffe for n cubes

[fverdugo]

Addresses issue #87

[codecov-io]

Codecov Report

Merging #88 into master will increase coverage by 0.19%.
The diff coverage is 93.05%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
+ Coverage   91.46%   91.66%   +0.19%     
==========================================
  Files          79       82       +3     
  Lines        4017     4161     +144     
==========================================
+ Hits         3674     3814     +140     
- Misses        343      347       +4

Impacted Files	Coverage Δ
src/RefFEs/RefFEs.jl	62.93% <ø> (ø)	⬆️
src/FESpaces/FEBases.jl	100% <100%> (ø)	⬆️
src/CellValues/CellValuesOperations.jl	97.43% <100%> (+0.29%)	⬆️
src/FESpaces/ConformingFESpaces.jl	98.6% <100%> (ø)	⬆️
src/FESpaces/DiscFESpaces.jl	100% <100%> (ø)
src/MultiField/MultiFEBases.jl	92.59% <100%> (+0.59%)	⬆️
src/RefFEs/PDiscRefFEs.jl	100% <100%> (ø)
src/Integration/Triangulations.jl	86.66% <50%> (-1.93%)	⬇️
src/FESpaces/FEFunctions.jl	86% <50%> (-4.91%)	⬇️
src/CellValues/CellMapApply.jl	91.13% <75%> (-0.87%)	⬇️
... and 8 more

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