PMD just released a big new major version, 7.0.0. This makes a fairly large change to the basic command-line UI, but is mostly otherwise compatible. Some of the output is slightly different for a few of the tests. I've changed the simulation tests to simulate PMD7, and the integration tests sometimes need to conditionalize the expected output. We also had one test (for a config file with no rules) that was obsolete even in PMD 6.55, which treated a file with no active rules as a warning rather than an error. Testing Done: Ran unit tests with both PMD 6.55.0 and 7.0.0. Saw that everything passed. Reviewed at https://reviews.reviewboard.org/r/13710/