Fixing misc issues

[fverdugo]

In particular issues #101 and #103

[codecov-io]

Codecov Report

Merging #104 into master will decrease coverage by 0.07%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
- Coverage   92.36%   92.29%   -0.08%     
==========================================
  Files          87       87              
  Lines        4532     4542      +10     
==========================================
+ Hits         4186     4192       +6     
- Misses        346      350       +4

Impacted Files	Coverage Δ
src/MultiField/MultiFEOperators.jl	81.25% <100%> (+6.25%)	⬆️
src/FESpaces/FEBases.jl	92.85% <50%> (-7.15%)	⬇️
src/MultiField/MultiFEBases.jl	92.3% <50%> (-4.92%)	⬇️

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