* 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>

New world Grudge

Co-authored-by: Alex Fikl <alexfikl@gmail.com>

- Rename, document the supporting functions for improved clarity
- Drop dim argument from (former) surface_normal

Co-authored-by: Alex Fikl <alexfikl@gmail.com>

Do not use CL-specific max, min, sum

The function registry bits are only relevant for symbolic operators,
and the broadcasting test duplicates what's already being done in
arraycontext.

This ensures that the symbolic stuff remains tested until we remove it.