- expose, for testing purposes, the load-from-YAML-data part
alongside the public constructor that reads a YAML file
- add test for building the list of instances
- QStringList doesn't round-trip correctly; add a test to
demonstrate that.
- Fix existing test to **not** use QStringList, but QVariantList
(of strings), which is how other code would use it.
The above is **kind** of moot because nothing uses the YAML-save
function, but it might.
While here, fix another test: YAML-loading can load JSON just fine.
- test insert, remove, emitted signals
- test loading and saving of YAML and JSON
This shows up a big bug in the YAML saving code (which was never
used, it seems, anyway)
- The test wants to read settings.conf, but by default it's run
from way inside the build dir, where there is no such file.
Go looking for one (but not too far).
