j2k: flatten test cases and testData directory structure

Move j2k/test/tests -> j2k/tests, j2k/test/testData -> j2k/testData

j2k/testData/fileOrElement/constructors/nestedClassNameInSuperParameters.java

@@ -0,0 +1,15 @@
+class Base {
+    Base(Nested nested){}
+
+    static class Nested {
+        Nested(int p){}
+
+        public static final int FIELD = 0;
+    }
+}
+
+class Derived extends Base {
+    Derived() {
+        super(new Nested(Nested.FIELD));
+    }
+}