docs: public static String getFindBugsEnginePluginLocation() {
          // findbugs.home should be set to the directory the plugin is
          // installed in.
          URL u = plugin.getBundle().getEntry("/");
          try {
              URL bundleRoot = FileLocator.resolve(u);
              String path = bundleRoot.getPath();
              if (FindBugsBuilder.DEBUG) {
                  System.out.println("Pluginpath: " + path); //$NON-NLS-1$
              }
              if (path.endsWith("/eclipsePlugin/")) {
                  File f = new File(path);
                  f = f.getParentFile();
                  f = new File(f, "findbugs");
                  path = f.getPath() + "/";
              }
  
              return path;
          } catch (IOException e) {
              FindbugsPlugin.getDefault().logException(e, "IO Exception locating engine plugin");
          }
          return null;
      }