working on signature generation for arrays

* more tests
* fix signature generation for Array<Array<Int>>

compiler/testData/compileJavaAgainstKotlin/ArrayOfIntegerArray.java

@@ -0,0 +1,7 @@
+
+class ArrayOfIntArray {
+    {
+        Integer[][] a = new Integer[0][];
+        Integer[][] r = namespace.ohMy(a, null);
+    }
+}