Clean up equivalent polynomials implementation and cutfem method

[cekees]

Mandatory Checklist

Please ensure that the following criteria are met:

• [x] Title of pull request describes the changes/features
• [x] Request at least 2 reviewers
• [x] If new files are being added, the files are no larger than 100kB. Post the file sizes.
• [x] Code coverage did not decrease. If this is a bug fix, a test should cover that bug fix. If a new feature is added, a test should be made to cover that feature.
• [x] New features have appropriate documentation strings (readable by sphinx)
• [x] Contributor has read and agreed with CONTRIBUTING.md and has added themselves to CONTRIBUTORS.md

As a general rule of thumb, try to follow PEP8 guidelines.

Description

[codecov[bot]]

Codecov Report

Merging #1242 (58cbbb5) into master (abb3f00) will increase coverage by 0.00%. The diff coverage is 82.65%.

@@           Coverage Diff           @@
##           master    #1242   +/-   ##
=======================================
  Coverage   52.81%   52.82%           
=======================================
  Files         531      531           
  Lines      109772   109802   +30     
=======================================
+ Hits        57975    58001   +26     
- Misses      51797    51801    +4     

Impacted Files	Coverage Δ
proteus/SpatialTools.py	57.17% <ø> (ø)
proteus/mprans/RANS2P.py	87.56% <ø> (ø)
proteus/config/__init__.py	55.17% <50.00%> (ø)
proteus/MeshTools.py	55.28% <80.26%> (+0.14%)	:arrow_up:
proteus/LinearSolvers.py	58.01% <93.33%> (+0.17%)	:arrow_up:
proteus/LinearAlgebraTools.py	78.70% <100.00%> (+0.06%)	:arrow_up:
proteus/NumericalSolution.py	78.14% <100.00%> (+0.02%)	:arrow_up:
proteus/tests/ci/poisson_3d_tetgen_c0p1_n.py	93.02% <100.00%> (ø)
proteus/tests/test_boundaryconditions.py	97.21% <0.00%> (-0.37%)	:arrow_down:

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