make more functions non-static

src/main/java/de/uni_hamburg/corpora/validation/ExbFileCoverageChecker.java

@@ -116,7 +116,7 @@ public class ExbFileCoverageChecker extends Checker implements CorpusFunction {
         return IsUsableFor;
     }
 
-    public static void setWhitelist() {
+    public void setWhitelist() {
         whitelist = new ArrayList<String>();
         whitelist.add(".git");
         whitelist.add(".gitignore");
@@ -141,7 +141,7 @@ public class ExbFileCoverageChecker extends Checker implements CorpusFunction {
      * Search function for getting all the files under the same folder with the
      * basic transcription file and sub-folders.
      */
-    public static void search(File folder, List<String> result) {
+    public void search(File folder, List<String> result) {
         for (File f : folder.listFiles()) {
             if (f.isDirectory()) {
                 search(f, result);