* Clone _setup_actx to permit catching leaks

* Point arraycontext at freeze-thaw-usability in req.txt

* Point requirements.txt back to main for arraycontext

* bessel function mangling -> BesselFunction: ScalarCallable

* query translation unit's default_entrypoint's args

* [drop before merge]: test with kcv3-e2

* Add transfer_requirements_git_urls from grudge to downstream projects

* Point requirements.txt for loopy back to main

Co-authored-by: Andreas Klöckner <inform@tiker.net>

* Add jump property to TracePair.

* Change jump --> diff

* Add simple smoke test for trace pair

* placate flake8

* Undo spurious chage to primitives.py

* Tweak TracePair docstrings

Co-authored-by: Andreas Kloeckner <inform@tiker.net>

Retire redundant examples

* Make nodal reductions mpi-aware

* Add clarifying remark for nodal reductions

Co-authored-by: Andreas Klöckner <inform@tiker.net>

* Use timestep estimation in mpi wave test

Co-authored-by: Andreas Klöckner <inform@tiker.net>

Grudge Refactoring

Update time-step utility functions

Co-authored-by: Andreas Klöckner <inform@tiker.net>

* Use mpi4py from conda for tests

* Drop "insecure" flag from curl in Github CI

* Drop "insecure" flag from curl in Gitlab CI

* Simplify WADG mass inverse

* Test mass inverse on warped geometry

* Always WADG all the time also for symbolic

* Fold test_nonaffine_mass_operator_inverse into test_mass_operator_inverse

Co-authored-by: Thomas Gibson <gibsonthomas1120@hotmail.com>