j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/superExpression/classAextendsB.java

@@ -0,0 +1,12 @@
+class B {
+  B(int i) {}
+  int call() {return 1;}
+}
+
+class A extends B {
+  A() {
+    super(10);
+  }
+
+  int call() { return super.call(); }
+}