* check all elements, not just the first one
* check all second derivatives (including cross ones)
* add tests for all of that

Test examples during CI

See merge request inducer/meshmode!74

Add cartoon DG solver

See merge request !70

Fix some remaining issues with 1D meshes

See merge request inducer/meshmode!71

Remove extra vertex for closed 2D curves

See merge request inducer/meshmode!72

Before, the function was constructing a mesh that had
an extra vertex when the curve was closed. This was inconcistent
with the group's `vertex_indices`.

get_connected_partitions: Allow meshes without a boundary

See merge request inducer/meshmode!69

Make make_opposite_face_connection work in 1D

See merge request inducer/meshmode!68

Make Mesh work without explicit vertices

See merge request inducer/meshmode!66

Allow projecting empty ChainedDiscretizationConnections

See merge request inducer/meshmode!67

Add prototype Github CI workflow

Use RefinerWithoutAdjacency in refine_uniformly

See merge request inducer/meshmode!65