j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/constructors/chain.kt

@@ -0,0 +1,23 @@
+fun C(arg1: Int, arg2: Int): C {
+    val __ = C(arg1, arg2, 0)
+    System.out.println()
+    return __
+}
+
+fun C(arg1: Int): C {
+    val __ = C(arg1, 0)
+    System.out.println()
+    return __
+}
+
+class C(arg1: Int, arg2: Int, arg3: Int)
+
+public class User {
+    class object {
+        public fun main() {
+            val c1 = C(1, 2, 3)
+            val c2 = C(5, 6)
+            val c3 = C(7)
+        }
+    }
+}