This PR reviews the expected-to-fail-right-now tests for `grind`, moving
some (now passing) tests to the main test suite, updating some tests,
and adding some tests about normalisation of exponents.
This PR make some minor changes to the grind annotation analysis script,
including sorting results and handling errors. Still need to add an
external UI.
This PR adds a script for analyzing `grind` E-matching annotations. The
script is useful for detecting matching loops. We plan to add
user-facing commands for running the script in the future.
