j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/comments/commentsForConstructors.java

@@ -0,0 +1,29 @@
+class A {
+    private int v;
+
+    // this is a primary constructor
+    A(int p) {
+        v = 1;
+    } // end of primary constructor body
+
+    // this is a secondary constructor 1
+    A() {
+        this(1);
+    } // end of secondary constructor 1 body
+
+    // this is a secondary constructor 2
+    A(String s) {
+        this(s.length());
+    } // end of secondary constructor 2 body
+}
+
+class B {
+    private int x;
+
+    // this constructor will disappear
+    B(int x) {
+        this.x = x;
+    } // end of constructor body
+
+    void foo(){}
+}