Write tests for the 8.x-1.x functionality

Working on this (a little bit each day)

Here's a baseline test.

From here we can require all new features/bugfixes to come with new test asserts - I'd be happy to help with adding them.

Test for #2581351: API flaw - modified defaults don't affect existing records is included but commented out - so once this is committed, that issue should only need to uncomment the line to add coverage.

Also adds schema and removes redundant field settings (strict schema checking happens in tests)

And here's a (commented) test for #2576695: OG Tags don't work - double slashes get replaced with one slash