Pde remove dof dimension

[TTitscher]

Solves #142.

The only place where there the dof dimension is needed is the calculation of the N matrix. This dimension is now extracted from the first node of the element, namely the NodeSimple::GetNumValues().

[codecov[bot]]

Codecov Report

Merging #154 into PDE_reviewed will decrease coverage by 0.07%. The diff coverage is 100%.

@@               Coverage Diff                @@
##           PDE_reviewed     #154      +/-   ##
================================================
- Coverage         63.94%   63.86%   -0.08%     
================================================
  Files               221      221              
  Lines              8678     8649      -29     
================================================
- Hits               5549     5524      -25     
+ Misses             3129     3125       -4

Impacted Files	Coverage Δ
...ics/interpolation/InterpolationTriangleQuadratic.h	100% <ø> (ø)	:arrow_up:
...anics/interpolation/InterpolationQuadSerendipity.h	81.81% <ø> (+8.48%)	:arrow_up:
...ics/interpolation/InterpolationTetrahedronLinear.h	81.81% <ø> (+8.48%)	:arrow_up:
src/mechanics/elements/ElementInterface.h	100% <ø> (ø)	:arrow_up:
src/mechanics/interpolation/InterpolationSimple.h	100% <ø> (ø)	:arrow_up:
...mechanics/interpolation/InterpolationTrussLinear.h	100% <ø> (ø)	:arrow_up:
...hanics/interpolation/InterpolationTriangleLinear.h	100% <ø> (ø)	:arrow_up:
.../mechanics/interpolation/InterpolationQuadLinear.h	100% <ø> (ø)	:arrow_up:
src/mechanics/mesh/UnitMeshFem.cpp	100% <100%> (ø)	:arrow_up:
test/mechanics/cell/PatchTest.cpp	100% <100%> (ø)	:arrow_up:
... and 9 more

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