Pde plate with hole

[TTitscher]

As a summary, this PR will:

• enable integration tests

  • old: PatchTest
  • old: CreepLaw
  • new: PlateWithHole

• improve visualization:

  • PointData method that visualizes spatial functions is now available for VoronoiHandler
  • the values of two dimensional dof types are written as three dimensional vectors. This enables the paraview feature "WarpByVector".
  • voronoi geometry for 3 ip triangle

• misc:

  • operator-= for `GlobalDofVector
  • add coordinate dependent load function for ´NeumannBc`
  • provide an idea for a class that helps with cell creation and assembly (in PlateWithHole.cpp)
  • remove FETI from the integration tests

[codecov[bot]]

Codecov Report

Merging #177 into PDE_reviewed will decrease coverage by 15.87%. The diff coverage is 93.02%.

@@                Coverage Diff                @@
##           PDE_reviewed     #177       +/-   ##
=================================================
- Coverage         81.06%   65.19%   -15.88%     
=================================================
  Files               225      287       +62     
  Lines              7297    11425     +4128     
=================================================
+ Hits               5915     7448     +1533     
- Misses             1382     3977     +2595

Impacted Files	Coverage Δ
...plications/integrationtests/mechanics/CreepLaw.cpp	96.47% <ø> (ø)
src/mechanics/mesh/MeshFem.h	100% <ø> (ø)	:arrow_up:
src/visualize/VoronoiHandler.h	100% <ø> (ø)	:arrow_up:
src/visualize/VoronoiGeometries.cpp	60.78% <0%> (-20.8%)	:arrow_down:
...integrationtests/mechanics/PlateWithHoleAnalytic.h	100% <100%> (ø)
src/mechanics/dofs/GlobalDofVector.h	100% <100%> (ø)	:arrow_up:
src/mechanics/mesh/MeshFem.cpp	100% <100%> (ø)	:arrow_up:
src/mechanics/integrands/NeumannBc.h	100% <100%> (ø)	:arrow_up:
test/mechanics/dofs/GlobalDofVector.cpp	100% <100%> (ø)	:arrow_up:
...ntests/metamodel/PolynomialLeastSquaresFitting.cpp	89.28% <100%> (ø)
... and 79 more

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