autotests: test the predicate-parser

Throw in ten strings for parsing to demonstrate conjunctions and conjunction nesting; also parse and take-apart a longer predicate.

Show how predicates apply to devices and that manual filtering and the list-functions that take predicates do the same thing. (This test requires there to be removable media, so it should be disabled in CI, among other places)

Demonstrate some of the interface-manipulations (this is based on internal knowledge of the matches() function), and that nothing is a volume and a drive at once.