j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/comments/commentsForConstructors.kt

@@ -0,0 +1,22 @@
+// this is a secondary constructor 2
+fun A(s: String): A {
+    return A(s.length())
+} // end of secondary constructor 2 body
+
+class A// this is a primary constructor
+(p: Int = 1) {
+    private val v: Int
+
+    {
+        v = 1
+    } // end of primary constructor body
+}// this is a secondary constructor 1
+// end of secondary constructor 1 body
+
+class B// this constructor will disappear
+(private val x: Int) // end of constructor body
+{
+
+    fun foo() {
+    }
+}