Per command default test set

[tingerrr]

Allow configuring the test set which is used by default using config options on a per-command basis. This also ties into being able to configure custom test set aliases.

One important use case for this is to clear up the confusion with update --all using the !ignored test set by default and, contrary to the option name, not updating all tests.

A good default for destructive commands (those for which --all was added in the first place) would be the empty set. This way, commands like edit, removeandupdate` get a more intuitive interface.