Merge remote-tracking branch 'upstream/master' into cory_box_tags

.github/workflows/ci.yml

.gitlab-ci.yml

.test-conda-env-py3.yml

doc/conf.py

examples/.gitignore

examples/multiple-meshes.py

examples/simple-dg.py

experiments/refinement-playground.py

meshmode/discretization/connection/face.py

meshmode/discretization/connection/opposite_face.py

meshmode/discretization/connection/projection.py

meshmode/discretization/poly_element.py

meshmode/distributed.py

meshmode/mesh/__init__.py

meshmode/mesh/generation.py

meshmode/mesh/io.py

meshmode/mesh/processing.py

meshmode/mesh/refinement/no_adjacency.py

meshmode/mesh/refinement/resampler.py

test/test_meshmode.py