- mark some TODO
- tighten up the YAML schema a little bit
- when unset, use 'quiet' rather than empty, to preserve compatibility
with existing configuration files.
SEE #1882
- These have **not** been fixed for validation, so the schema's themselves
will fail to load. This is a consequence of variations in JSON-Schema
representations through various drafts. Fixing the schemata is
fairly straightforward.
This gives us 19 new tests, all of which fail.