#897 Fix description when replacing value with empty set
#900 Support multiple test engines
#822 Fix regression of NPE when reading classpath manifest
#798 Fix regression of jvmArgs parameter support via maven
#797 Fix regression of line coverage on console
As a result of #900 the testPlugin parameter is now defunct, but pitest will continue to accept it without error for this release. Pitest will use any test-engines supplied on the classpath, falling back to the built in JUnit4 support when other test engines cannot handle the class.