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dg1d: Add Bsplines

Florian Attenederrequested to merge
fa/bspline into main

This adds multiple things:

  • A Bspline module for working with 2nd order Bsplines.
  • Extends DGElement with the kind=:modal_bspline2 option.
  • Updates docstrings and refactors some tests.
  • Adds a LG module for Legendre-Gauss quadrature.
  • Adds a plotting script plot/bspline.jl to tinker with the Bspline2 approximation.

Also adds a new option to the Mesh parameters section:

  • kind = "modal_bspline2": Utilize a 2nd order modal Bspline Ansatz for the DG evolution.

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