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Draft: [bug][draft] Switch to triangle grid

Carsten Gräser requested to merge poisson-pq2-python-triangles into master

This implements the following changes:

  • Add a gmsh coarse grid file consisting of two triangles on the unit square.
  • Load and refine the grid in
  • Add some debug output to

When using the grid, the example fails with a segfault. This does not come from the assembler, but from the boundary treatment code that is generated from C++. Adding debug output reveals that here the basis provides buggy global indices. In fact even the number of elements is not correct here.

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