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dg1d: Add Bsplines1

Florian Attenederrequested to merge
fa/bspline1 into main

Continuation of !210 (merged)

This adds a dispatch type Bspline1 similar to Bspline2. Based on this we implement the necessary method to be able to use it in DGElement.

I also fixed a subtle bug in the quadrature rules I used in some of the Bspline methods. That is, I accidentally used a LG rule with Npts=2, which corresponds to a N=Npts-1=1 order rule that is exact for polynomials up to 2*N=2 order. But for Bspline2 we encounter fourth order polynomials, so we should be using Npts=3.

Also adds a new option to the Mesh parameters section:

  • kind = "modal_bspline1": Utilize a 1st order modal Bspline Ansatz for the DG evolution.

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