In spite of there being considerable documentation sometimes in the
config file, we go with CC0 because we don't want the notion of
'derived work' of a config file.
The example `settings.conf` is also CC0. Add some docs to
it while we're at it.
The build instructions are not that interesting, it's a toss-up
between CC0 and BSD-2, but because other CMake bits are BSD-2-Clause,
apply that to more CMakeLists. The copyright date isn't all that
accurate, but these are just inconsequential files.
While here, tidy up and get rid of some useless intermediates.
- 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.
