test both the -type and -relationship options
whitespace
remove unused predicate and unnecessary defined checks on configs
also test dumped configs for -default options
more diagnostics on failure
test the validity of the metaspec in every test, noting where the meta tests are faulty
now adds prompting for required prereq types, unless -prompt = 0
Dist-Zilla-Plugin-OptionalFeature-0.017

          - new -prompt feature (enabled by default for 'required' feature
            prereqs), which interactively prompts the user about the feature