NONE: fix of the bug where every build was adding new Clover report artifact to the job;

CloverBuildWrapper - adding CloverPublisher only if there is no existing one with the same report directory (manual search  replaced the List.contains() which called Object.equals() which was wrong)
CloverPublisher - build.getActions().add() replaced by build.addAction()
pom.xml - using LTS version of parent plugin (1.509.2), using clover core 3.1.12.1; rollback to 4.1.0-SNAPSHOT; file formatting