Match API issues

[davenquinn]

The current implementation of the match API created in #281 fails several match API tests set up in the first round of development. This means that our approach used to match the SGP dataset last year will produce invalid results.

These tests are disabled in CI because they depend on access to an actual, full Macrostrat database with all the data that predicates a match. They can be run locally with macrostrat test all or macrostrat test all -k match.

It may be that some of these tests need to be updated to match the output format of the new response, or there may be more significant underlying issues with the matching logic.

[davenquinn]

We could potentially add these tests (or derivatives) to CI if we change db -> test_db in the fixtures and load some limited test data. But this is probably out of scope.